Common fossil in Paleozoic rocks
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TRILOBITECommon fossil in Paleozoic rocks
AUGITECommon mineral in rocks
pyroxeneany of a group of minerals common in igneous rocks
pyroxenesPYROXENE, any of a group of minerals common in igneous rocks
suitecollection of minerals or rocks having some characteristic in common (as type or origin)
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
varioleslight-colored spherule, common in some igneous rocks, that gives a pockmarked appearance to weathered rock surfaces
variolelight-colored spherule, common in some igneous rocks, that gives a pockmarked appearance to weathered rock surfaces
cordieritesstrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
plagioclaseA form of feldspar consisting of aluminosilicates of sodium and/or calcium, common in igneous rocks and typically white
oligoclaseA feldspar mineral common in siliceous igneous rocks, consisting of a sodium-rich plagioclase (with more calcium than albite)
obeliascolonial hydroid of the genus Obelia, common in temperate seas and appearing as a delicate, mosslike growth on rocks, pilings, etc.
obeliacolonial hydroid of the genus Obelia, common in temperate seas and appearing as a delicate, mosslike growth on rocks, pilings, etc.
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