mineral
Milky quartz with a dark mineral inclusion
Quartz (SiO₂), likely containing a small inclusion of biotite or another dark mineral
AI-generated identification · may be incorrectWhite to translucent, vitreous luster, irregular fracture, and no obvious cleavage; quartz has Mohs hardness 7 and a hexagonal crystal structure. The dark inclusion is too small to identify confidently from the image.
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Physical properties
White to translucent, vitreous luster, irregular fracture, and no obvious cleavage; quartz has Mohs hardness 7 and a hexagonal crystal structure. The dark inclusion is too small to identify confidently from the image.
Formation & geological history
Quartz commonly crystallizes from silica-rich fluids in veins and pegmatites, or forms as a constituent of many rock types. Its age and exact geological setting cannot be determined from the specimen alone.
Uses & applications
Quartz is used in glass, abrasives, electronics, and ornaments; attractive pieces are collected or used decoratively.
Geological facts
Milky appearance results from microscopic fluid inclusions or structural defects that scatter light.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; common worldwide in veins and igneous and metamorphic rocks. The dark spot may be an attached mineral or inclusion.
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Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous