a triclinic basic silicate of iron and calcium occurring as glassy greenish black crystals
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babingtonitea triclinic basic silicate of iron and calcium, occurring as glassy greenish-black crystals
babingtonitesBABINGTONITE, a triclinic basic silicate of iron and calcium, occurring as glassy greenish-black crystals
allanitemember of the epidote group, a silicate of calcium, cerium, aluminum, and iron, occurring chiefly in brown-to-black masses or prismatic crystals
pyroxenesAny of a large class of rock-forming silicate minerals, generally containing calcium, magnesium, and iron and typically occurring as prismatic crystals
staurolitemineral, basic iron aluminum silicate, Fe2Al2O7(SiO4)4(OH), occurring in brown to black prismatic crystals, which are often twinned in the form of a cross
cyanitemineral, aluminum silicate, Al2SiO5, occurring in blue or greenish bladed triclinic crystals, used as a refractory
kyanitesmineral, aluminum silicate, Al2SiO5, occurring in blue or greenish bladed triclinic crystals, used as a refractory
cyanitesmineral, aluminum silicate, Al2SiO5, occurring in blue or greenish bladed triclinic crystals, used as a refractory
kyanitemineral, aluminum silicate, Al2SiO5, occurring in blue or greenish bladed triclinic crystals, used as a refractory