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megacryst is a crystal or grain that is considerably larger than the encircling matrix. They are found in igneous and metamorphic rocks. Megacrysts can
Megacryst
Mafic intrusive igneous rock composed predominantly of plagioclase
distinctive compositions. These are the so-called high-alumina orthopyroxene megacrysts (HAOM). HAOM are distinctive because 1) they contain higher amounts of
Anorthosite
Mountain in Victoria, Australia
transition from maar eruption to scoria cone development, and includes megacryst and xenolith. The Mount was historically a traditional meeting and trading
Mount_Noorat
Granite rock in southwest England
feldspar megacrysts and coarse-grained granite with few megacrysts. To the southwest there is an area of coarse-grained granite with small megacrysts and several
Cornubian_batholith
Mountain in British Columbia, Canada
vast Northern Cordilleran Volcanic Province and is the only location of megacrysts made of kaersutite in the volcanic zone. Llangorse Mountain got its name
Llangorse_Mountain
Mountain in Poland
crystals—so-called "megacrysts"—up to 3 cm long set in a fine-grained matrix of olivine, clinopyroxene, plagioclase and nepheline. These megacrysts are aluminian-sodian
Ostrzyca_(hill)
Zirconium silicate mineral
Ernst, Richard E.; Shumlianska, Liudmyla O. (December 15, 2021). "Zircon megacrysts from Devonian kimberlites of the Azov Domain, Eastern part of the Ukrainian
Zircon
Peninsula on the island of Kerguelen
outcrops called Le Trièdre and Val Phonolite. As well as one phlogopite megacryst outcrop on it called Tête de l'Homme. The Ronarc'h Peninsula was featured
Ronarc'h_Peninsula
Group of inosilicate minerals
Luigi; Chadwick, Jane P.; Schulz, Bernhard (2017-03-16). "Amphibole megacrysts as a probe into the deep plumbing system of Merapi volcano, Central Java
Amphibole
Suite of intrusive rock in the Sierra Nevada
Cathedral Peak Granodiorite is its porphyritic habit with very large megacrysts of alkali feldspar commonly reaching 10, occasionally even 20 centimeters
Cathedral_Peak_Granodiorite
Process by which small crystals dissolve in solution for the benefit of larger crystals
temperature. It is often ascribed as a process in the formation of orthoclase megacrysts, as an alternative to the physical processes governing crystal growth
Ostwald_ripening
Oldest-surviving crustal material from the Hadean Eon
13486–13492. Valley JW, Kinny PD, Schulze DJ, Spicuzza MJ (1998). "Zircon megacrysts from kimberlite: oxygen isotope variability among mantle melts". Contributions
Hadean_zircon
Pleistocene stratovolcano in the Andes
Hornblende crystals with dimensions of 5–10 millimetres (0.20–0.39 in) and megacrysts of feldspar with dimensions of up to 1.5 centimetres (0.59 in) are also
Tumisa
Equation describing a phase boundary
Ostwald ripening is thought to occur in the formation of orthoclase megacrysts in granites as a consequence of subsolidus growth. See rock microstructure
Ostwald–Freundlich_equation
Angolan politician and diplomat
Andrew J.; Grütter, Herman S. (November 2009). "Fe-rich and Na-rich megacryst clinopyroxene and garnet from the Luxinga kimberlite cluster, Lunda Sul
Paulino_Baptista
Hill in New Jersey, United States
consists of an extremely fine-grained groundmass with fine-to coarse-grained megacrysts of biotite, diopside, aegerine-augite, orthoclase, magnetite, apatite
Rutan_Hill
West African geological formation
volcanic products are rich in peridotite and pyroxenite xenoliths and megacrysts. The youngest volcanoes rest on Neolithic terraces and are of Holocene
Tuareg_Shield
Geologic province in the Pacific Northwest of North America
groups, including kaersutitic amphibole megacrysts, clinopyroxene megacrysts and plagioclase megacrysts. Megacrysts made of kaersutite are known to be found
Northern Cordilleran Volcanic Province
Northern_Cordilleran_Volcanic_Province
Chain of volcanoes in the Gulf of Guinea
Volcanic Line Lavas: Constraints from Isotopic Variations in Lavas and Megacrysts from the Biu and Jos Plateaux". Journal of Petrology. 46 (1): 169–190
Cameroon_line
Geologic formation in New Hampshire, United States
metamorphic events. Minerals in the Cardigan Pluton include large K-feldspar megacrysts and quartz, plagioclase, muscovite, garnet, biotite, and less abundant
Cardigan_Pluton
Lake in the South Island of New Zealand
metasediment. Albert Edward Granite is coarser, with pink K-feldspar megacrysts and green-brown biotite. There are also small amounts of carboniferous
Lake_Hauroko
Dartmoor and Southern England's highest point
moor where the exposed rock has noticeably fewer of the large feldspar megacrysts that are typical of most of Dartmoor's tors. Each of the outcrops displays
High_Willhays
Submarine volcanic eruption near the Canary Islands
; Hansteen, T. H.; Anderson, E.: Ankaramitic Lavas and Clinopyroxene Megacrysts From the Tanganasoga Volcano, El Hierro Island (Canary Archipelago), American
2011–12_El_Hierro_eruption
Plutonic rock found in New Mexico, US
period. The San Pedro quartz monzonite contains euhedral to anhedral pink megacrysts of microcline with a maximum size of 1.5 cm. The ground mass is blue-gray
San_Pedro_quartz_monzonite
Body of granitic rock
Counties in southern North Carolina. The Lilesville Granite is composed of megacrysts up to 4 cm of pink potassium-rich feldspar surrounded by gray plagioclase
Lilesville_Granite
Mountain range in California, United States
gneiss and hornblende-quartz monzodiorite gneiss. Both gneisses contain megacrysts of potassium feldspar that are 2–10 cm across. These gneisses have a quartz-poor
Granite Mountains (eastern San Bernardino County, California)
Granite_Mountains_(eastern_San_Bernardino_County,_California)
Volcanic Line Lavas: Constraints from Isotopic Variations in Lavas and Megacrysts from the Biu and Jos Plateaux". Journal of Petrology. 46 (1): 169–190
Biu_Plateau
the centre of the pluton the next unit is a tonalite-granodiorite, with megacrysts. The central part is a coarse-grained granodiorite. The roughly circular
Donegal_batholith
bluish-gray quartz monzonite porphyry. It contains large phenocrysts (megacrysts) of orthoclase and in many places, rounded bipyramids of quartz. These
McNulty_rhyolite
Mountain in New Hampshire, United States
the Early Devonian Cardigan Pluton (a foliated granitic body with large megacrysts of potassium feldspar). The Cardigan pluton has been dated by the Rb/Sr
Mount_Cardigan
Volcano in Chile
2011). "Quantitative petrological evidence for the origin of K-feldspar megacrysts in dacites from Taapaca volcano, Chile". Contributions to Mineralogy and
Taapaca
Volcanic field in Algeria
Xenoliths include peridotite and pyroxenite, and amphibole and feldspar form megacrysts in the rocks. Xenoliths appear to, in part, originate from a metasomatized
Manzaz_volcanic_field
Volcanic field in San Bernardino County, California
1130/B36390.1. Colville, Alan A.; Novak, Gary A. (October 1991). "Kaersutite megacrysts and associated crystal inclusions from the Cima volcanic field, San Bernardino
Cima_volcanic_field
American geochemist and petrologist
5223-5231. Valley JW, Kinny PD, Schulze DJ & Spicuzza MJ (1998) Zircon Megacrysts from Kimberlite: Oxygen isotope heterogeneity among mantle melts. Contributions
John_W._Valley
with biotite and muscovite-rich granite as well as potassium feldspar megacrysts, hornblende and large mica-tourmaline or lepidolite pegmatites. S-type
Geology_of_Thailand
Geologic formation in Northeastern Ontario, Canada
TGB. The Spawning Lake Stock in Briggs and Chambers townships contains megacrysts that reach 2 cm (0.79 in) to 3 cm (1.2 in) in diameter. It shears through
Temagami_Greenstone_Belt
Island in Hong Kong
all of Beaufort Island, is the last large magma intrusion in Hong Kong. Megacrysts are commonly found. Islands portal Waglan Island Po Toi Island Wikimedia
Beaufort_Island_(Hong_Kong)
American mineralogist and academic (1944–2026)
Abundance and partitioning of OH in a high-pressure magmatic system: megacrysts from the Monastery kimberlite, South Africa. Journal of Petrology, 45
George_R._Rossman
Mountain in Victoria, Australia
coarse ejecta exposed around the summit includes red and green olivine and megacrysts of high-temperature (some of the largest known Victorian examples) and
Mount_Franklin_(Victoria)
Geologic region in British Columbia and Yukon, Canada
lava flows comprise spinel lherzolite, xenoliths composed of granite and megacrysts of olivine, pyroxene and spinel. An eruption was reported in the Atlin
Volcanic history of the Northern Cordilleran Volcanic Province
Volcanic_history_of_the_Northern_Cordilleran_Volcanic_Province
Settlement in Waikato, New Zealand
north and northeast sides of the crater and basalt boulders with augite megacrysts in the crater. There is a pā site on the south side of the crater, with
Te_Kawa
quartz-muscovite or quartz-eye schist containing quartz and feldspar megacrysts. Beds are typically light in color, ranging from pink to white to green
Glenwoody_Formation
Suite granite often has a distinctive pink colour, due to the K-feldspar megacrysts. The Median Batholith forms the rocks between the Western and Eastern
Geology of the Tasman District
Geology_of_the_Tasman_District
H.; Anderson, E. (December 2009). Ankaramitic Lavas and Clinopyroxene Megacrysts From the Tanganasoga Volcano, El Hierro Island (Canary Archipelago). American
Tanganasoga
Plateau in Russia
vols.] / Ch. ed. A.M. Prokhorov. - 3rd ed. 1969-1978. Pyroxenites and megacrysts from Vitim picrite-basalts (Russia): polybaric fractionation of rising
Vitim_Plateau
Plutonic rock found in New Mexico, US
sericite are present. Some of the plagioclase takes the form of subhedral megacrysts up to 5 mm across. Metamorphism may have reached the amphibolite metamorphic
San_Miguel_gneiss
Oxide mineral
Wikidata Q105611595. Taylor L. A. and PokhilenkoN., “Ferrous freudenbergite in ilmenite megacrysts: a unique paragenesis from the Dalnaya Kimberlite, Yakutia,” Am. Mineral
Freudenbergite
Mountain in New Zealand
the volcano is composed of ankaramite basalt, a rare type of lava with megacrysts of clinopyroxene that is also found on Karioi, Mount Pirongia and Te Kawa
Kakepuku
Azufre. Andesites contain quartz and dacites-rhyodacites contain sanidine megacrysts. In hydrothermally altered areals alunite, barite, dickite, kaolinite
Nevados_de_Pastos_Grandes
British geologist and academic author
AlGangorssuaq, South Greenland (1964) Anorthosite Xenoliths and Plagioclase Megacrysts of South Greenland (1968) He married Dorothy May Stowe and had one son
William_Trevelyan_Harry
Mesoproterozoic pluton in New Mexico, U.S.
period. The unit is a pink fine- to medium-grained rock with microcline megacrysts in some locations. It is subtly foliated in some locations, particularly
Joaquin_quartz_monzonite
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