FAYALITE a mineral form of iron
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fayalitesFAYALITE, a mineral form of iron
fayalitea mineral form of iron
triphylitea bluish-grey rare mineral that consists of lithium iron phosphate in orthorhombic crystalline form and occurs in pegmatites
triphylitesTRIPHYLITE, a bluish-grey rare mineral that consists of lithium iron phosphate in orthorhombic crystalline form and occurs in pegmatites
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
cummingtonitea mineral of the amphibole group, hydrated magnesium iron silicate
cummingtonitesCUMMINGTONITE, a mineral of the amphibole group, hydrated magnesium iron silicate
columbitea mineral, niobate and tantalate of iron and manganese, aka niobite
ferromagnesian(of a rock or mineral) Containing iron and magnesium as major components
arsenopyriteA silvery-gray mineral consisting of an arsenide and sulfide of iron
columbitesCOLUMBITE, a mineral, niobate and tantalate of iron and manganese, aka niobite
enstatitea mineral of the pyroxene group, a silicate of magnesia with some iron
enstatitesENSTATITE, a mineral of the pyroxene group, a silicate of magnesia with some iron
crocidolitea fibrous mineral consisting mainly of silicate of iron and sodium, called blue asbestos
pyrrhotiteA reddish-bronze mineral consisting of iron sulfide, typically forming massive or granular deposits
crocidoliteA fibrous blue or green mineral consisting of a silicate of iron and sodium
idocrasea mineral that is a complex silicate especially of calcium, magnesium, iron, and aluminum
ilmenitesA black mineral consisting of iron titanium oxide, of which it is the main ore
haematitesA reddish-black mineral consisting of ferric oxide. It is an important ore of iron
crocidolitesCROCIDOLITE, a fibrous mineral consisting mainly of silicate of iron and sodium, called blue asbestos
hematitesA reddish-black mineral consisting of ferric oxide. It is an important ore of iron
ilmeniteA black mineral consisting of iron titanium oxide, of which it is the main ore
piedmontitea dark-red mineral, a hydrated silicate of calcium, aluminium, managanese and iron also PIEMONTITE
hyperstheneA greenish rock-forming mineral of the orthopyroxene class, consisting of a magnesium iron silicate
piemontitea dark-red mineral, a hydrated silicate of calcium, aluminium, managanese and iron also PIEDMONTITE
piedmontitesPIEDMONTITE, a dark-red mineral, a hydrated silicate of calcium, aluminium, managanese and iron also PIEMONTITE
piemontitesPIEMONTITE, a dark-red mineral, a hydrated silicate of calcium, aluminium, managanese and iron also PIEDMONTITE
gadoliniteA rare dark brown or black mineral, consisting of a silicate of iron, beryllium, and rare earths
iolitesstrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
iolitestrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
tetrahedriteA gray mineral consisting of a sulfide of antimony, iron, and copper, typically occurring as tetrahedral crystals
cordieritesstrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
gossanrust-colored deposit of mineral matter at the outcrop of a vein or orebody containing iron-bearing materials
chalcopyriteA yellow crystalline mineral consisting of a sulfide of copper and iron. It is the principal ore of copper
sideritecommon mineral, iron carbonate, FeCO3, usually occurring in yellowish to deep-brown cleavable masses: a minor ore of iron
magnetitea black isometric mineral of the spinel group that is an oxide of iron and an important iron ore
marcasitesA bronze-yellow mineral consisting of iron disulfide but differing from pyrite in typically forming aggregates of tabular crystals
marcasiteA bronze-yellow mineral consisting of iron disulfide but differing from pyrite in typically forming aggregates of tabular crystals
jarositeyellowish or brownish mineral, a hydrous sulfate of potassium and iron, KFe3(SO4)2(OH)6, occurring in small crystals or large masses
pentlanditeA bronze-yellow mineral that consists of a sulfide of iron and nickel and is the principal ore of nickel