mineral
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
Pyrite: Hardness 6-6.5, brassy yellow/gold, metallic luster, cubic system. Sunstone: Hardness 6-6.5, orange-brown, vitreous luster, triclinic system with aventurescence.
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Physical properties
Pyrite: Hardness 6-6.5, brassy yellow/gold, metallic luster, cubic system. Sunstone: Hardness 6-6.5, orange-brown, vitreous luster, triclinic system with aventurescence.
Formation & geological history
Pyrite forms in hydrothermal veins and sedimentary environments. Sunstone forms in igneous contexts, specifically within basaltic lavas or pegmatites.
Uses & applications
Pyrite is used for sulfuric acid production and ornamental jewelry (marcasite style). Sunstone is primarily a gemstone for jewelry and decorative carvings.
Geological facts
Pyrite is famously known as 'Fool\'s Gold' due to its color. Sunstone\'s shimmer is caused by tiny inclusions of copper or hematite that reflect light.
Field identification & locations
Identify Pyrite by its green-black streak and cubic shape. Identify Sunstone by its internal orange 'glitter.' Commonly found in Peru and Spain (Pyrite) or Oregon, USA and Norway (Sunstone).
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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)
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