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Macdonaldite is a rare barium silicate mineral with a chemical formula of BaCa4Si16O36(OH)2·10H2O. Macdonaldite was first described in 1965 and named for Gordon Andrew Macdonald (1911-1978) an American volcanologist at the University of Hawaii.
Industry:Geology; Mining
Ulrichite is a rare green uranium phosphate mineral (CaCu(UO2)(PO4)2·4H2O). It crystallizes as monoclinic prisms which occur as apple green acicular radiating clusters. It is radioactive and exhibits strong yellow fluorescence under ultraviolet radiation.
Industry:Geology; Mining
Arctite (Na2Ca4(PO4)3F) is a colourless mineral found in the Kola Peninsula northern Russia. It's Mohs hardness is 5 and has a density of 3.11-3.13. Arctite is transparent with a vitreous lustre. Arctite has a perfect cleavage and a trigonal crystal system.
Industry:Geology; Mining
Baryte, or barite, (BaSO4) is a mineral consisting of barium sulfate. The baryte group consists of baryte, celestine, anglesite and anhydrite. Baryte itself is generally white or colorless, and is the main source of barium. Baryte and celestine form a solid solution (Ba,Sr)SO4.
Industry:Geology; Mining
Sabinaite (Na4Zr2TiO4(CO3)4) is a rare carbonate mineral. It crystallizes in the monoclinic crystal system as colorless to white prisms within cavities. It is more typically found as powdery coatings and masses. It has a specific gravity of 3.36.
Industry:Geology; Mining
Minium is the naturally occurring form of lead tetroxide, Pb2+2Pb4+O4 also known as red lead. Minium is a light-to-vivid red and may have brown-to-yellow tints. It typically occurs in scaly-to-earthy masses. It crystallizes in the tetragonal crystal system.
Industry:Geology; Mining
Nobleite is a rare borate mineral with the chemical formula CaB6O9(OH)2·3(H2O). It was discovered in 1961, in Death Valley, California, and is named for Levi F. Noble, a USGS geologist, in honor of his contributions to the geology of the Death Valley region.
Industry:Geology; Mining
Terlinguaite is the naturally occurring mineral with formula Hg2ClO. It is formed by the weathering of other mercury-containing minerals. Discovered in 1900 in the Terlingua District of Brewster County, Texas for which it is named. Its color is yellow, greenish yellow, brown or olive green.
Industry:Geology; Mining
Akimotoite is a rare silicate mineral ((Mg,Fe)SiO3) in the ilmenite group of minerals. It has a vitreous luster, is colorless, and has a white or colorless streak. It crystallizes in the trigonal crystal system in space group R3. It is the silicon analogue of geikielite (MgTiO3).
Industry:Geology; Mining
Cornwallite is an uncommon copper arsenate mineral with formula Cu5(AsO4)2(OH)4. It forms a series with the phosphate pseudomalachite and is a dimorph of the triclinic cornubite. It is a green monoclinic mineral which forms as radial to fibrous encrustations.
Industry:Geology; Mining
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