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Chesterite ((Mg,Fe)17Si20O54(OH)6) is a rare silicate mineral that can be compared to amphiboles, micas, and jimthompsonite. Chesterite is named after Chester, Vermont, where it was first described in 1977. The specific geologic setting within its origin is the Carleton talc quarry in Chester, Vermont.
Industry:Geology; Mining
Kalininite (ZnCr2S4) is a thiospinel mineral found in Russia in 1985 in the Pereval Marble Quarry, Slyudyanka (Sludyanka), Lake Baikal area, Irkutskaya Oblast', Prebaikalia (Pribaikal'e), Eastern-Siberian Region. It was named for P. I. Kalinin, Russian mineralogist and petrologist, investigator of the southern Baikal region.
Industry:Geology; Mining
Kambaldaite, NaNi4(CO3)3(OH)3·3H2O, is an extremely rare hydrated sodium nickel carbonate mineral described from gossanous material associated with Kambalda type komatiitic nickel ore deposits at Kambalda, Western Australia, and Widgie Townsite nickel gossan, Widgiemooltha, Western Australia.
Industry:Geology; Mining
Pyrrhotite is an unusual iron sulfide mineral with a variable iron content: Fe(1-x)S (x = 0 to 0.2). The FeS endmember is known as troilite. Pyrrhotite is also called magnetic pyrite because the color is similar to pyrite and it is weakly magnetic. The magnetism decreases as the iron content decreases, and the troilite is non-magnetic.
Industry:Geology; Mining
Shortite is a sodium - calcium carbonate mineral, with the chemical formula Na2Ca2(CO3)3. It was discovered by J. J. Fahey in well cuttings from the Green River Formation, Sweetwater County, Wyoming USA, and was named to honor Maxwell N. Short (1889-1952), Professor of Mineralogy, University of Arizona.
Industry:Geology; Mining
Berlinite (aluminium phosphate, chemical fomula AlPO4) is a rare phosphate mineral. It has the same crystal structure as quartz with a low temperature polytype isostructural with α-quartz and a high temperature polytype isostructural with β-quartz. Berlinite can vary from colourless to greyish or pale pink and has translucent crystals.
Industry:Geology; Mining
Papagoite is a rare cyclosilicate mineral. Chemically, it is a calcium copper aluminium silicate hydroxide, found as a secondary mineral on slip surfaces and in altered granodiorite veins, either in massive form or as microscopic crystals that may form spherical aggregates. Its chemical formula is CaCuAlSi2O6(OH)3.
Industry:Geology; Mining
Segelerite is a complex phosphate mineral with formula CaMgFe3+OH(PO4)2·H2O. It occurs in pegmatites and forms striking green or chartreuse crystals. It was discovered in 1974 in the Black Hills of South Dakota by an amateur mineralogist from New York, Curt G. Segeler (1901-1989), after whom it is named.
Industry:Geology; Mining
Sellaite is a magnesium fluoride mineral with the formula MgF2. It crystallizes in the tetragonal crystal system typically as clear to white vitreous prisms. It may be fibrous and occur as radiating aggregates. It has a Mohs hardness of 5 to 6 and a specific gravity of 2.97 to 3.15. Refractive index values are nω = 1.378 and nε = 1.390.
Industry:Geology; Mining
Tourmaline is a crystal boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors. The name comes from the Sinhalese word "Thuramali", which applied to different gemstones found in Sri Lanka.
Industry:Geology; Mining
