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Steacyite is a complex silicate mineral containing thorium and uranium; formula Kvariable(Ca,Na)2(Th,U)Si8O20. It forms small brown or yellow green crystals, often cruciform twinned crystals. It is radioactive. It was discovered at Mont-Saint-Hilaire, Quebec in 1982 and is named after Harold Robert Steacy (1923-2012), mineralogist.
Industry:Geology; Mining
Acanthite, Ag2S, crystallizes in the monoclinic system and is the stable form of silver sulfide below 173 °C. Argentite is the stable form above that temperature. As argentite cools below that temperature its cubic form is distorted to the monoclinic form of acanthite. Below 173 °C acanthite forms directly. Acanthite is the only stable form in normal air temperature.
Industry:Geology; Mining
Aheylite is a rare phosphate mineral with formula (Fe2+Zn)Al6((OH)4
Industry:Geology; Mining
Balangeroite is found in one of the most important chrysotile mines in Europe, the Balangero Serpentinite. It is considered an asbestiform in an assemblage of other mineral phases like chrysotile, magnetite and Fe-Ni alloys. In addition to its fibrous occurrence, balangeroite's association with chrysotile raises concerns about its potential toxicity when its fibers are inhaled.
Industry:Geology; Mining
Bayleyite is an uranium carbonate mineral with the chemical formula: Mg2(UO2)(CO3)3·18(H2O). It is a secondary mineral which contains magnesium, uranium and carbon. It is a bright yellow color. Its crystal habit is acicular but is more commonly found as crusts on uranium bearing ores. It has a Mohs hardness of about 2-2.5.
Industry:Geology; Mining
Fornacite is a rare lead, copper chromate arsenate hydroxide mineral with the formula: Pb2Cu(CrO4)(AsO4)(OH). It forms a series with the phosphate mineral vauquelinite. It forms variably green to yellow, translucent to transparent crystals in the monoclinic - prismatic crystal system. It has a Mohs hardness of 2.3 and a specific gravity of 6.27.
Industry:Geology; Mining
Meyerhofferite is a hydrated borate mineral, with the chemical formula Ca2B6O6(OH)10·2(H2O), CaB3O3(OH)5·H2O or Ca2(H3B3O7)2·4(H2O). It occurs principally as an alteration product of inyoite, another borate mineral.
Industry:Geology; Mining
Archerite is a phosphate mineral with chemical formula (K,NH4)H2PO4. It's named after Michael Archer (born 25 March 1945), professor of Biology, University of New South Wales. Its type locality is Petrogale Cave, Madura Roadhouse, Dundas Shire, Western Australia, Australia. It occurs in guano containing caves as wall encrustations and stalactites.
Industry:Geology; Mining
Chromium is a chemical element which has the symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point. The name of the element is derived from the Greek word "chrōma" (χρώμα), meaning colour, because many of its compounds are intensely coloured.
Industry:Geology; Mining
Akrochordite is an exceptionally rare hydrated hydrous arsenate mineral of the formula (Mn,Mg)4(AsO4)2(OH)4.4H2O and represents a small group of rare in the nature manganese (Mn) arsenates and, similarly to most other Mn-bearing arsenates, possess pinkish colour. It is typically associated with metamorphic Mn deposits.
Industry:Geology; Mining
