Heavy iron black mineral
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TANTALITEHeavy iron-black mineral.
wolframsmineral, iron manganese tungstate, (Fe,Mn)WO4, occurring in heavy grayish-black to brownish-black tabular or bladed crystals: an important ore of tungsten
wolframmineral, iron manganese tungstate, (Fe,Mn)WO4, occurring in heavy grayish-black to brownish-black tabular or bladed crystals: an important ore of tungsten
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
ilmenitesA black mineral consisting of iron titanium oxide, of which it is the main ore
hornblendedark-green to black mineral of the amphibole group, calcium magnesium iron and hydroxyl aluminosilicate
haematitesA reddish-black mineral consisting of ferric oxide. It is an important ore of iron
gadoliniteA rare dark brown or black mineral, consisting of a silicate of iron, beryllium, and rare earths
magnetitea black isometric mineral of the spinel group that is an oxide of iron and an important iron ore
wolframiteA black or brown mineral that is the chief ore of tungsten. It consists of a tungstate of iron and manganese
tantaliteA rare, dense, black mineral consisting of a mixed oxide of tantalum, of which it is the principal source, and iron
stannitemineral, iron-black to steel-gray in color, with a metallic luster, copper iron tin sulfide, Cu2FeSnS4: an ore of tin
gadolinitea mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron
tantalitesA rare, dense, black mineral consisting of a mixed oxide of tantalum, of which it is the principal source, and iron
augiticsilicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks
gadolinitesGADOLINITE, a mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron
augitessilicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks
augitesilicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks
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
hematitevery common mineral, iron oxide, Fe2O3, occurring in steel-gray to black crystals and in red earthy masses: the principal ore of iron
andraditeA mineral of the garnet group, containing calcium and iron. It occurs as yellow, green, brown, or black crystals, sometimes of gem quality
rutilea reddish-brown to black mineral that consists of titanium dioxide usually with a little iron and has a brilliant metallic or adamantine luster
columbiteA black mineral, typically occurring as dense, tabular crystals, consisting of an oxide of iron, manganese, niobium, and tantalum. It is the chief ore of niobium
columbitesA black mineral, typically occurring as dense, tabular crystals, consisting of an oxide of iron, manganese, niobium, and tantalum. It is the chief ore of niobium
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