Common mineral in rocks
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AUGITECommon mineral in rocks
iolitestrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
iolitesstrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
cordieritesstrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
oligoclaseA feldspar mineral common in siliceous igneous rocks, consisting of a sodium-rich plagioclase (with more calcium than albite)
biotitesvery common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and metamorphic rocks
biotitevery common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and metamorphic rocks
LENADMineral in igneous rocks.
PYROXENEMineral found in igneous rocks
MICAMineral found in igneous, sedimentary, and metamorphic rocks
trichitea minute mineral body found in volcanic rocks
trichitesTRICHITE, a minute mineral body found in volcanic rocks
labradoriteA mineral of the plagioclase feldspar group, found in many igneous rocks
acmiterare pyroxene mineral, sodium-ferric iron silicate, NaFe(Si2O6), found in feldspathoid rocks
leuciticwhitish or grayish mineral, potassium aluminum silicate, KAlSi2O6, found in alkali volcanic rocks
leucitewhitish or grayish mineral, potassium aluminum silicate, KAlSi2O6, found in alkali volcanic rocks
leuciteswhitish or grayish mineral, potassium aluminum silicate, KAlSi2O6, found in alkali volcanic rocks
phlogopiteA brown micaceous mineral that occurs chiefly in metamorphosed limestone and magnesium-rich igneous rocks
uralitean amphibole mineral, similar to hornblende, that replaces pyroxene in some igneous and metamorphic rocks
trichiteany of various minute, hairlike mineral bodies occurring in certain vitreous igneous rocks, esp. obsidian
nephelinicof or like nepheline, a mineral found in igneous rocks and used for ceramics and enamels
augitesa usually black or dark green mineral that consists of aluminous pyroxene and is found especially in igneous rocks
augitea usually black or dark green mineral that consists of aluminous pyroxene and is found especially in igneous rocks
andesinemineral, intermediate in the plagioclase feldspar group, having a play of colors and usually found as crystals in igneous rocks
andalusiteA gray, green, brown, or pink aluminosilicate mineral occurring mainly in metamorphic rocks as elongated rhombic prisms, sometimes of gem quality
sphenesmineral, calcium titanium silicate, CaTiSiO5, occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge-shaped crystals
titanitemineral, calcium titanium silicate, CaTiSiO5, occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge-shaped crystals
sphenemineral, calcium titanium silicate, CaTiSiO5, occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge-shaped crystals
sodalitesmineral, sodium aluminum silicate, Na4Al3Si3O12Cl, occurring massive and in crystals, usually blue in color and found in certain alkali-rich igneous rocks
sodalitemineral, sodium aluminum silicate, Na4Al3Si3O12Cl, occurring massive and in crystals, usually blue in color and found in certain alkali-rich igneous rocks
hydroxyapatiteA mineral of the apatite group that is the main inorganic constituent of tooth enamel and bone, although it is rare in rocks
nephelineA colorless, greenish, or brownish mineral consisting of an aluminosilicate of sodium (often with potassium) and occurring as crystals and grains in igneous rocks
cordieriteA dark blue mineral occurring chiefly in metamorphic rocks. It consists of an aluminosilicate of magnesium, and also occurs as a dichroic gem variety
analcimea white or slightly colored mineral that consists of hydrated silicate of sodium and aluminum and occurs in various igneous rocks in massive form or in crystals
apophylliteA mineral occurring typically as white glassy prisms, usually as a secondary mineral in volcanic rocks. It is a hydrated silicate and fluoride of calcium and potassium
hornblendesA dark brown, black, or green mineral of the amphibole group consisting of a hydroxyl alumino-silicate of calcium, magnesium, and iron, occurring in many igneous and metamorphic rocks
enstatiteA translucent crystalline mineral of varying colors that occurs in some igneous rocks and stony meteorites. It consists of magnesium silicate and is a member of the pyroxene group
sodalitea transparent to translucent mineral that consists of a silicate of sodium and aluminum with some chlorine, has a vitreous or greasy luster, and is found in various igneous rocks
graphitesA gray, crystalline, allotropic form of carbon that occurs as a mineral in some rocks and can be made from coke. It is used as a solid lubricant, in pencils, and as a moderator in nuclear reactors
tourmalineA brittle gray or black mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and polarizing properties, and is used in electrical and optical instruments and as a gemstone