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Smoky quartz. Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [ 6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within ...
Jasper. Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [ 1][ 2] is an opaque, [ 3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron (III) inclusions. Jasper breaks with a smooth surface and is used for ...
Quartz is a hard, crystalline mineral composed of silica ( silicon dioxide ). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral and ...
Borolanite – Variety of nepheline syenite from Loch Borralan, Scotland – A variety of nepheline syenite from Loch Borralan, Scotland; Blue Granite – Variety of monzonite, an igneous rock; Epidosite – Hydrothermally altered epidote- and quartz-bearing rock; Felsite – Very fine-grained volcanic rock that sometimes contains larger crystals
Varieties of the mineral Quartz. Subcategories. This category has the following 2 subcategories, out of 2 total. C. Chert (3 C, 23 P) Q. Quartz gemstones (2 C ...
Quartzite also comes in a variety of hues, from white, gray, and tan to green, pink, and blue. Basically, quartzite can hit a wide range of the color spectrum. ... Quartz can range from $55 to $90 ...
Often inter-grown, massive, radiated, granular, globular, and stalactitic. The mineral pyrite ( / ˈpaɪraɪt / PY-ryte ), [ 6] or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Fe S 2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral. [ 7]
Garnierite is a general name for a green nickel ore which is found in pockets and veins within weathered and serpentinized ultramafic rocks. It forms by lateritic weathering of ultramafic rocks and occurs in many nickel laterite deposits in the world.