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Crystal larger than the rock grains that surround it in an igneous rock
A phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous
Phenocryst
Mica mineral in the biotite subgroup
partially resorbed phenocrysts or an accessory phase in basalts generated at depth. Phlogopite mica is a commonly known phenocryst and groundmass phase
Phlogopite
Textural form of igneous rock with large grained crystals in a fine matrix
difference in size between the tiny matrix crystals and the much larger phenocrysts. Porphyries may be aphanites or phanerites, that is, the groundmass may
Porphyry_(geology)
Lithostratigraphic unit
(SiO2=bulk 67.5–68.5% (dacite), matrix 75–76% (rhyolite) and consistent phenocryst content (35–50%) and mineralogical composition (plagioclase, sanidine
Fish_Canyon_Tuff
Igneous rock with large and small crystals
difference in the size of mineral crystals, with the larger crystals known as phenocrysts. Both extrusive and intrusive rocks can be porphyritic, meaning all types
Porphyritic
Volcanic rock
amount of phenocrysts and/or microlites. The white pumices erupted by Pinatubo in 1991 are examples of pumice with an unusually high phenocryst content
Pumice
Magnesium- and iron-rich extrusive igneous rock
crystals (phenocrysts) that formed before the extrusion event that brought the magma to the surface, embedded in a finer-grained matrix. These phenocrysts are
Basalt
Meteorite found in Niger
olivine phenocrysts with a maximum size of 3 mm that are embedded into a groundmass of maskelynite and ophitic pyroxene. These olivine phenocrysts contain
Northwest_Africa_16788
Type of volcanic rock
crystals (phenocrysts) of plagioclase formed prior to the extrusion that brought the magma to the surface, embedded in a finer-grained matrix. Phenocrysts of
Andesite
Finer-grained material in a rock within which coarser material is embedded
finer-grained, often microscopic, crystals in which larger crystals, called phenocrysts, are embedded. This porphyritic texture is indicative of multi-stage
Matrix_(geology)
Rare feldspathoid mineral in the sodalite group
found in spinel dunite xenoliths from La Palma, Canary Islands. Ecuador: Phenocrysts found in alkaline extrusive rocks (tephrite), product of effusive volcanism
Hauyne
Mode of igneous volcanic rock formation
during eruption. Any larger crystals visible to the human eye, called phenocrysts, form earlier while slowly cooling in the magma reservoir. When igneous
Extrusive_rock
Igneous rock rich in silica and feldspar
may contain phenocrysts of mafic minerals, usually hornblende, pyroxene or a feldspar mineral, and may need to be named after their phenocryst mineral, such
Felsic
Relationship between materials which compose a rock
layers of materials. Porphyritic texture is one in which larger pieces (phenocrysts) are embedded in a background mass made of much finer grains. Fragmental
Texture_(geology)
Type of igneous rock
is a variety of porphyritic phonolite or trachyte with rhomb-shaped phenocrysts of anorthoclase with variable amounts of olivine and augite in a glassy
Kenyte
Rock formed from lava erupted from a volcano
glass in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are identifiable
Volcanic_rock
Type of volcanic rock containing large porphyritic crystals of quartz
under high magnifying powers. In addition to quartz there are usually phenocrysts of feldspar, mostly orthoclase, though a varying amount of plagioclase
Quartz-porphyry
Topics referred to by the same term
which is identified and classified according to the mineralogy of its phenocrysts Phenotype (clinical medicine), the presentation of a disease Phenotype
Phenotype_(disambiguation)
Glassy volcanic rock
A vitrophyre is a porphyritic volcanic rock in which phenocrysts are embedded in a glassy matrix. Vitrophyres are contrasted from typical porphyritic
Vitrophyre
Infilled gas cavity in extrusive igneous rock
common in American usage, while amygdale is more common in British usage. Phenocryst – Crystal larger than the rock grains that surround it in an igneous rock
Amygdule
Type of rock
rhyolite with distinctive blue quartz and reddish microcline feldspar phenocrysts found in the Llano Uplift north of Llano, Texas, and dated at 1.1 bya
Llanite
Natural siliceous or siliceous-aluminous material
unaltered pyroclastic rocks is mainly determined by the presence of phenocrysts and the chemical composition of the parent magma. The major component
Pozzolana
Large mineral crystal in a metamorphic rock
schists) against the platy mica matrix. A similar type of crystal is a phenocryst, a large crystal in an igneous rock. Porphyroblasts are often confused
Porphyroblast
Type of volcanic rock
the presence of olivine and titanium-rich augite in its groundmass and phenocrysts, and nepheline in its CIPW norm. Alkali basalt is chemically classified
Alkali_basalt
Dark vesicular volcanic rock
solidifies. Most scoria is composed of glassy fragments and may contain phenocrysts. A sample from Yemen was mainly composed of volcanic glass with a few
Scoria
Type of igneous rock
peppering the lighter color minerals. Occasionally some individual crystals (phenocrysts) are larger than the groundmass, in which case the texture is known as
Granite
be further classified based on the nature of their origin, either as: Phenocrysts, which crystallize in molten rock material (lava or magma) and are hence
Megacryst
Caldera in the state of Utah
Spring are almost exclusively made up of calc-alkaline (68 wt. % SiO2) and phenocryst-rich (38 vol.%) dacite. While not a viscous as rhyolite, these eruptions
Wah_Wah_Springs_Caldera
High pyroclastic shield volcano in the Sahara
basanite and tephrite. The erupted rocks define two alkaline suites. Phenocryst chemistry and content varies between the various rocks; among the minerals
Emi_Koussi
Stratovolcano in Peru
potassium-rich calc-alkaline rock type, typical for Peruvian volcanoes. Phenocrysts are composed of amphibole, augite, biotite, enstatite, plagioclase and
Misti
Potassium-rich variety of basaltic trachyandesite
basaltic trachyandesite, composed of olivine, augite and plagioclase phenocrysts in a groundmass with calcic plagioclase and sanidine and some dark-colored
Shoshonite
Type of volcanic rock
fragments are commonly blown apart by the explosive eruption. Most are phenocrysts that grew in the magma, but some may be exotic crystals such as xenocrysts
Ignimbrite
Rock retrieved from the Moon in 1971 by Apollo 15
coarse-grained, porphyritic rock with rounded olivine phenocrysts (1 mm) and subhedral zoned pyroxene phenocrysts (0.5–2 mm) set in a matrix of poikilitic plagioclase
Great_Scott_(lunar_sample)
to the mineralogy of its phenocrysts, when it is impossible to determine the mineralogy of the groundmass. Because phenocrysts represent the earlier part
Phenotype_(igneous_petrology)
Extrusive igneous rock
Rhomb porphyry is an example with usually large porphyritic rhomb shaped phenocrysts embedded in a very fine-grained matrix. Some of the best known trachytes
Trachyte
Type of ultrapotassic igneous rock
belonging to the "lamprophyre facies" are characterized by the presence of phenocrysts of mica and/or amphibole together with lesser clinopyroxene and/or melilite
Lamprophyre
Variety of high-magnesium basalt that is very rich in the mineral olivine
very rich in the mineral olivine. It is dark with yellow-green olivine phenocrysts (20-50%) and black to dark brown pyroxene, mostly augite. The olivine-rich
Picrite_basalt
Pyroclastic flow sheet deposit
Spring Tuff after an ignimbrite sample from within the caldera matched the phenocryst makeup and age of the Peach Spring Tuff. The caldera eruption is dated
Peach_Spring_Tuff
Subgroup of phyllosilicate minerals within the trioctahedral mica group
biotite found in its volcanic equivalent, rhyolite. Biotite is an essential phenocryst in some varieties of lamprophyre. Biotite is occasionally found in large
Biotite
rock – An ultramafic, ultrapotassic intrusive rock dominated by mafic phenocrysts in a feldspar groundmass Latite – Type of volcanic rock – A silica-undersaturated
List_of_rock_types
Calcic titanium bearing amphibole mineral
the iron replacing magnesium in the structure. Kaersutite occurs as phenocrysts in alkalic volcanic rocks, in nodules of peridotite and gabbro in alkalic
Kaersutite
Igneous, volcanic rock, of felsic (silica-rich) composition
texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral assemblage is predominantly
Rhyolite
Geological technique
degassing, etc.) and their associated eruptions. In simple terms, the mineral phenocryst acts as a "crystal clock" to determine how long a magmatic process took
Diffusion_chronometry
Metamorphic rock type
have remnant protolith mineralogy, this is rare. More common is to find phenocrysts of pyroxene, olivine, plagioclase and even magmatic amphibole such as
Amphibolite
Common alteration product of olivine
basalt in the presence of liquid water and can be described[by whom?] as a phenocryst, i.e. it has macroscopically visible crystals in a fine-grained groundmass
Iddingsite
British island in the southern Atlantic
andesite may be an older rock. The basalts contain sometimes olivine; phenocrysts include augite, hypersthene and plagioclase. Dolerite and gabbro have
Saunders Island, South Sandwich Islands
Saunders_Island,_South_Sandwich_Islands
Geological complex of ancient rocks in Western Australia
Dugel Gneiss exists as a medium-grained leucocratic metagranite with phenocrysts of K-feldspar which has recrystallized into granulite facies. The rock
Narryer_Gneiss_terrane
Volcanic landform in the Andes
potassium-rich calc-alkaline series of the Central Volcanic Zone. It has a phenocryst content of 20%. Dacite clasts cover the inward-sloping walls of the rampart
Corral_de_Coquena
Geological formation in British Columbia, Canada
to 50% plagioclase phenocrysts forms the upper lava flows of the Beta Peak eruptive centre. Olivine and clinopyroxene phenocrysts are the second and third
Nido_Formation
Mountain in Tanzania, highest in Africa
ago. Tephriphonolite to phonolite lavas "characterized by rhomb mega-phenocrysts of sodic feldspars" of the Rhomb Porphyry group, dated to 460,000–360
Mount_Kilimanjaro
Topics referred to by the same term
Porphyritic, the general igneous texture of a rock with two distinct crystal (phenocryst) sizes Porphyry copper deposit, a primary (low grade) ore deposit of copper
Porphyry
Rare porphyritic volcanic rock
southwestern Alberta, Canada. It is characterized by dominant analcime phenocrysts in a matrix of analcime, sanidine and alkalic pyroxene with accessory
Blairmorite
Volcanic rock intermediate in composition between andesite and rhyolite
separate calc-alkaline rocks with oligoclase phenocrysts (dacites) from rocks with orthoclase phenocrysts (rhyolites). Dacite consists mostly of plagioclase
Dacite
Rock composed mostly of the mineral chromite
Chromitite with bronzite phenocrysts from Stillwater Igneous Complex
Chromitite
Form of potassium feldspar
its presence in the groundmass of felsic rocks, sanidine is a common phenocryst in rhyolites and, to a lesser extent, rhyodacites. Trachyte consists largely
Sanidine
Rock formed through the cooling and solidification of magma or lava
porphyry. Porphyritic texture develops when the larger crystals, called phenocrysts, grow to considerable size before the main mass of the magma crystallizes
Igneous_rock
Hill in Gujarat, India
Katsuhiko (March 2000). "Melt inclusions in pyroxene and plagioclase phenocrysts from Pavagadh igneous suite, Gujarat, India". Journal of Geosciences
Pavagadh_Hill
Igneous rock composed of very small crystals invisible to the naked eye
in the fine groundmass, or matrix. The larger inclusions are called phenocrysts. They consist essentially of very small crystals of minerals such as
Aphanite
Mesozoic formations below it by basal conglomerates. The basalts hold phenocrysts that developed before the magma reached the earth surface. These basalts
Ashangi_Basalts
Point-counting technique used in geology
plane-polarized light on top, cross-polarized light on bottom. Landing on the large phenocryst of amphibole (center, clear in plane light, orange in cross-polarized
Gazzi-Dickinson_method
Headland and tourist attraction in Cornwall, England
End. Adjacent to the hotel the granite is coarse-grained with large phenocrysts of orthoclase, sometimes more than 5 in (13 cm) in length. To the north
Land's_End
Geologic formation in New Mexico
image The La Cueva Member is an unwelded to poorly welded tuff with phenocrysts of quartz and sanidine and traces of pyroxene and magnetite. It has been
Bandelier_Tuff
Study of igneous rocks
make this method especially useful: first, clinopyroxene is a common phenocryst in igneous rocks easy to identify; and secondly, the crystallization of
Igneous_petrology
Dormant volcano in the Russian Far East
consisting of varying levels of porosity and phenocrysts. The main minerals found in these phenocrysts are olivine, pyroxene, plagioclase, ilmenite,
Kamen_(volcano)
term glomeroporphyritic (also cumulophyritic) refers to the grouping of phenocrysts, not necessarily of the same mineral, into distinct clusters within porphyritic
Glomeroporphyritic
Volcanic plug in Morro Bay, California, United States
(hornblende), biotite, pyroxene (augite), quartz, and glass; it also includes phenocrysts of plagioclase. Its silicon dioxide (SiO2) content ranges from 63 to
Morro_Rock
Volcanic field in Argentina
basaltic andesite, which when in lava form is grey to black in colour. Phenocryst composition in the rocks varies, encompassing olivine, orthopyroxene,
Cerro_Bitiche
Volcanic eruption in the Philippines
climactic event. The most abundant phenocryst minerals were hornblende and plagioclase, but an unusual phenocryst mineral was also present – the calcium
1991 eruption of Mount Pinatubo
1991_eruption_of_Mount_Pinatubo
Hard, peralkaline igneous rock, a type of light blue grey rhyolite
hard, peralkaline igneous rock, a type of light blue grey rhyolite. Phenocrysts are sodic sanidine with minor albite and bipyramidal quartz. The blue
Comendite
Active volcano in Cameroon near the Gulf of Guinea
containing roughly 20–25 % phenocrysts of euhedral to sub‑hedral olivine, clinopyroxene and plagioclase. Olivine phenocrysts make up around 10 % of these
Mount_Cameroon
have alkaline lava mineralogy, with large augite, olivine and magnetite phenocryst crystals, surrounded by a matrix of smaller crystals such as bytownite
Geology of São Tomé and Príncipe
Geology_of_São_Tomé_and_Príncipe
Volcano in Chile
thick. Biotite, hornblende, plagioclase and quartz form most of the phenocrysts in these layers. Five different dacitic lava domes and lava dome like
Choquelimpie
Megalithic site in West Java, Indonesia
intrusion. The andesite porphyry consists of plagioclase and pyroxene phenocrysts surrounded by an aphanitic groundmass of volcanic glass. These stone
Gunung_Padang
Rock consolidated from volcanic ash
Individual tuff beds can be "fingerprinted" by their chemical composition and phenocryst assemblages. Absolute ages for tuff beds can be determined by K-Ar, Ar-Ar
Tuff
Volcano in northwest Argentina
products are porphyritic, including the late andesites which contain phenocrysts of hornblende and plagioclase with smaller amounts of biotite, clinopyroxene
Chivinar
Volcanoes in Salar de Atacama, Chile
iron-titanium oxides, olivine, orthopyroxene, plagioclase and pyroxene phenocrysts. There are noticeable differences in the composition of the northern
Tilocálar
Island in the southern Indian Ocean
hotspot believed to be located close to the island. The aphyric (no phenocrysts) basalts found on Saint Paul are distinct from other basalts found to
Île_Saint-Paul
geothermobarometry, but clinopyroxene is especially useful because it's a common phenocryst in igneous rocks and easy to identify, and the crystallization of jadeite
Clinopyroxene_thermobarometry
Seamount in the United States of America
the tholeiitic family. The rock family has a medium potassium content. Phenocryst phases contained in the rocks are olivine, plagioclase and pyroxene. Sulfur
NW_Rota-1
Peralkaline rhyolite type of volcanic rock
On Pantelleria the rock is usually found as a vitrophyre containing phenocrysts of anorthoclase or sanidine. Quartz is found only in the most strongly
Pantellerite
Type of volcanic rock
never abundant, and nepheline also is unusual. In some limburgites large phenocrysts of dark brown hornblende and biotite are found, mostly with irregular
Limburgite
The greywackes are mineralogically very similar, but richer in quartz phenocrysts and their matrix is enriched in phyllosilicates. They are probably derived
Thiviers-Payzac_Unit
Plutonic rock
have formed as cumulates in a magma chamber. Cumberlandite has light phenocrysts of labradorite in a dark, fine to medium-grained matrix of magnetite
Cumberlandite
Molten rock expelled by a volcano during an eruption
tendency to form phenocrysts. Higher iron and magnesium tends to manifest as a darker groundmass, including amphibole or pyroxene phenocrysts. Mafic or basaltic
Lava
Highest peak of the Central Ural in Sverdlovsk Oblast
ranging in thickness from the finest vein to 10 inches, and claimed that phenocrysts of magnetic ironstone grains occur almost everywhere in the augite rock
Mountain_Kachkanar
Very large volume eruption of basalt lava
when it begins to crystallize. Flood basalts are almost devoid of large phenocrysts, larger crystals present in the lava prior to its being erupted to the
Flood_basalt
Mountain in Chile
potassium. Its lavas are dotted with phenocrysts, which vary from 2 to 25 percent of their mass. These phenocrysts are typically made of plagioclase, but
Calabozos
Rare type of granite
clusters of radially-arranged acicular tourmaline crystals enclosed by phenocrysts of orthoclase and quartz in a matrix of quartz, tourmaline, alkali feldspar
Luxullianite
Mountain in Oregon, United States
and formed glassy deposits with phenocrysts including plagioclase, augite, hypersthene, and olivine. These phenocrysts are relatively sparse among the
Pelican_Butte
Type of volcanic rock
porphyritic variety of basanite containing abundant pyroxene and olivine phenocrysts. It contains minor amounts of plagioclase and accessory biotite, apatite
Ankaramite
Aspect of Egyptian economy
to white phenocrysts Greenish-black porphyry with pale green to white phenocrysts Black porphyry with pale green to mostly white phenocrysts Some of the
Stone quarries of ancient Egypt
Stone_quarries_of_ancient_Egypt
Time period c. 12,900–11,700 years ago
van den Bogaard, Paul (June 1995). "40Ar/39Ar ages of sanidine phenocrysts from Laacher See Tephra (12,900 yr BP): Chronostratigraphic and petrological
Younger_Dryas
Hot semifluid material found beneath the surface of Earth
tendency to form phenocrysts. Higher iron and magnesium tends to manifest as a darker groundmass, including amphibole or pyroxene phenocrysts. Mafic or basaltic
Magma
Uncommon extrusive rock
Phonolite Clinkstone Extrusive igneous rock Dark, prismatic phenocrysts of aegirine in phonolite sample Composition Primary nepheline, sodalite, hauyne
Phonolite
Active stratovolcano on Sumbawa, Indonesia
contain phenocrysts of apatite, biotite, clinopyroxene, leucite, magnetite, olivine and plagioclase, with the exact composition of the phenocrysts varying
Mount_Tambora
Rock formation in Wyoming, Montana, and Idaho
respectively. The ignimbrite sheet was formed from rhyolite magma and contains phenocrysts of quartz, sanidine, and subordinate sodic plagioclase, along with minor
Lava_Creek_Tuff
Active volcanoes in Southern California
composition and defines a potassium-rich suite (see QAPF diagram). Scarce phenocrysts include amphibole, anorthoclase, apatite, clinopyroxene, ilmenite, magnetite
Salton_Buttes
Wilderness in the state of New Hampshire
This rock appears pink, red, green or grey, with medium-sized phenocrysts. Such phenocrysts, usually quartz or feldspar, make up 20%-40% of the rock, and
Pemigewasset_Wilderness
Mountain in the Cascade range in California
silicon dioxide) magma chambers with felsic (rich in feldspar and quartz) phenocrysts. Some dacitic crystals were partially reabsorbed as a result of mixing
Chaos_Crags
Mountain range in Utah, United States
sedimentary rocks. The most abundant igneous rocks are porphyritic, with phenocrysts of hornblende and plagioclase: these rocks are called diorite in some
La_Sal_Mountains
PHENOCRYST
PHENOCRYST
PHENOCRYST
PHENOCRYST
Boy/Male
Christian & English(British/American/Australian)
Residence Name
Surname or Lastname
English (Midlands)
English (Midlands) : variant of Weston.John Wesson came from England to Salem, MA, in 1644.
Boy/Male
American, British, English
Lives at the Castle Ford
Biblical
possession, possessed;acquisition, fabrication
Boy/Male
Gaelic Irish
Twin.
Girl/Female
English American
Healer.
Boy/Male
Greek
Son of Helen.
Girl/Female
Tamil
Kratika | கà¯à®°à®¾à®‚திகா
Boy/Male
Sikh
Humble, Meek, Obedient
Girl/Female
Arabic
Finder; Excited
PHENOCRYST
PHENOCRYST
PHENOCRYST
PHENOCRYST
PHENOCRYST