Mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
AI-generated identification · may be incorrectHardness of 5-6 on the Mohs scale, typically a pale blue to green color, waxy to subvitreous luster, triclinic crystal system. Usually occurs in massive or microcrystalline forms.
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Physical properties
Hardness of 5-6 on the Mohs scale, typically a pale blue to green color, waxy to subvitreous luster, triclinic crystal system. Usually occurs in massive or microcrystalline forms.
Formation & geological history
Formed through the secondary alteration of rocks, often in arid regions where groundwater percolates through copper-rich rocks and reacts with aluminum and phosphorus-bearing minerals.
Uses & applications
A popular gemstone used extensively in jewelry, especially Native American and Southwestern styles.
Geological facts
Turquoise is one of the oldest known gemstones, used by ancient civilizations such as the Egyptians, Persians, and Native Americans. It is the birthstone for December.
Field identification & locations
Identified by its distinctive blue-green color and waxy luster. Often found in arid regions like the southwestern United States, Iran, and China.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
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
Septarian Pebble
Septarian nodule / Concretion
sedimentary