mineral
Amazonite
Microcline feldspar (KAlSi3O8)
Hardness of 6 on the Mohs scale, greenish-blue to turquoise color, vitreous to pearly luster, triclinic crystal system, good cleavage, specific gravity of 2.56-2.58
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Physical properties
Hardness of 6 on the Mohs scale, greenish-blue to turquoise color, vitreous to pearly luster, triclinic crystal system, good cleavage, specific gravity of 2.56-2.58
Formation & geological history
Formed in pegmatites and granitic rocks, as well as hydrothermal veins, crystallization from cooling magma rich in potassium and water
Uses & applications
Used in ornamental carvings, cabochons, polished tumbled stones, and gemstone jewelry
Geological facts
The vibrant blue-green color was traditionally thought to be caused by copper, but modern research indicates it is due to trace amounts of lead and water within the feldspar structure
Field identification & locations
Identified by its distinctive mottled green-blue color often with white intersecting lines (tartan twinning effect visible in raw forms); found in Russia, Colorado (USA), Brazil, and Madagascar
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Regolith / Silicate Mineral Aggregate
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Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
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Septarian Pebble
Septarian nodule / Concretion
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Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Schist
Schist
Metamorphic