MINERALS
MINERALS
Andalusite
Andalusite is an aluminium nesosilicate mineral with the chemical formula Al₂SiO₅. Andalusite is trimorphic with kyanite and sillimanite, being the lower pressure mid temperature polymorph.
Anhydrite
Anhydrite is a mineral—anhydrous calcium sulfate, CaSO₄. It is in the orthorhombic crystal system, with three directions of perfect cleavage parallel to the three planes of symmetry
Apatite
Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite and chlorapatite, with high concentrations of OH−, F− and Cl− ions, respectively, in the crystal
Arsenopyrite
Arsenopyrite is an iron arsenic sulfide. It is a hard metallic, opaque, steel grey to silver white mineral with a relatively high specific gravity of 6.1. When dissolved in nitric acid, it releases elemental sulfur
Augite
Augite is a common rock-forming pyroxene mineral with formula (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6. The crystals are monoclinic and prismat
Azurite
Azurite is a soft, deep blue copper mineral produced by weathering of copper ore deposits. It is also known as Chessylite after the type locality at Chessy-les-Mines near Lyon, France
Barite
Baryte or barite is a mineral consisting of barium sulfate. The baryte group consists of baryte, celestine, anglesite and anhydrite. Baryte is generally white or colorless, and is the main source of barium
Bauxite
Bauxite, an aluminium ore, is the world's main source of aluminium. It consists mostly of the minerals gibbsite, boehmite and diaspore, mixed with the two iron oxides goethite and haematite, the clay
Benitoite
Benitoite is a rare blue barium titanium silicate mineral, found in hydrothermally altered serpentinite. Benitoite fluoresces under short wave ultraviolet light, appearing bright blue to bluish white in color
Andalusite
Andalusite is an aluminium nesosilicate mineral with the chemical formula Al₂SiO₅. Andalusite is trimorphic with kyanite and sillimanite, being the lower pressure mid temperature polymorph.
Anhydrite is a mineral—anhydrous calcium sulfate, CaSO₄. It is in the orthorhombic crystal system, with three directions of perfect cleavage parallel to the three planes of symmetry
Apatite
Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite and chlorapatite, with high concentrations of OH−, F− and Cl− ions, respectively, in the crystal
Arsenopyrite is an iron arsenic sulfide. It is a hard metallic, opaque, steel grey to silver white mineral with a relatively high specific gravity of 6.1. When dissolved in nitric acid, it releases elemental sulfur
Augite is a common rock-forming pyroxene mineral with formula (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6. The crystals are monoclinic and prismat
Azurite
Azurite is a soft, deep blue copper mineral produced by weathering of copper ore deposits. It is also known as Chessylite after the type locality at Chessy-les-Mines near Lyon, France
Barite
Baryte or barite is a mineral consisting of barium sulfate. The baryte group consists of baryte, celestine, anglesite and anhydrite. Baryte is generally white or colorless, and is the main source of barium
Bauxite, an aluminium ore, is the world's main source of aluminium. It consists mostly of the minerals gibbsite, boehmite and diaspore, mixed with the two iron oxides goethite and haematite, the clay
Benitoite
Benitoite is a rare blue barium titanium silicate mineral, found in hydrothermally altered serpentinite. Benitoite fluoresces under short wave ultraviolet light, appearing bright blue to bluish white in color
Beryl- Beryl is a mineral composed of beryllium aluminium cyclosilicate with the chemical formula Be₃Al₂(SiO₃)₆. Well-known varieties of beryl include emerald and aquamarine
is an ore mineral of copper, and is known for its iridescent tarnish. "Peacock Ore", which is sold to amateur mineral collectors and tourists, is often labeled as a variety of Bornite. However, most Peacock Ore in reality is Chalcopyrite treated with acid, which produces a strongly-colored iridescent tarnish.
Calcite is a carbonate mineral and the most stable polymorph of
calcium carbonate. The Mohs scale of mineral hardness, based on scratch
hardness comparison, defines value 3 as "calcite"
Cassiterite is a tin oxide mineral, SnO₂. It is generally opaque,
but it is translucent in thin crystals. Its luster and multiple crystal
faces produce a desirable gem
A pseudomorph is a mineral that has replaced another
mineral atom by atom, but it leaves the original mineral's crystal shape
intact. Chalcocite has been known to form pseudomorphs of the
minerals bornite, covellite, chalcopyrite, pyrite, enargite, millerite,
galena and sphalerite.
Chalcopyrite is a copper iron sulfide mineral that crystallizes in
the tetragonal system. It has the chemical formula CuFeS₂. It has a
brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs
scale.
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