mineral
Pyrite
Iron Sulfide (FeS2)
Hardness 6-6.5 on Mohs scale; Brass-yellow metallic color; Metallic luster; Isometric/Cubic crystal system; Poor/Indistinct cleavage; Specific gravity 4.9-5.2
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Physical properties
Hardness 6-6.5 on Mohs scale; Brass-yellow metallic color; Metallic luster; Isometric/Cubic crystal system; Poor/Indistinct cleavage; Specific gravity 4.9-5.2
Formation & geological history
Formed in high and low temperature hydrothermal veins, by magmatic segregation, as an accessory mineral in igneous rocks, and in sedimentary rocks such as shale and coal
Uses & applications
Primary source of sulfur and sulfuric acid; used in the manufacture of fertilizers, chemicals, and paper; occasionally used as a gemstone in 'marcasite' jewelry; source of iron in early industrial history
Geological facts
Commonly known as 'Fool's Gold' due to its resemblance to precious metals; creates sparks when struck against steel or flint; can contain trace amounts of actual gold and arsenic
Field identification & locations
Identify by its brassy color, cubic crystal habits, and blackish-green streak; found globally in mining districts, notably in Spain, Peru, and the USA; collectors look for well-defined cubes and pyritohedron shapes
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Arenite (SiO2 based)
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral