mineral
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
AI-generated identification · may be incorrectPyrite: 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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Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous