mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to cream, opaque, with a vitreous to dull luster and irregular fracture; Mohs hardness 7, trigonal crystal structure, no cleavage. The rough, weathered surface makes precise identification uncertain.
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Physical properties
White to cream, opaque, with a vitreous to dull luster and irregular fracture; Mohs hardness 7, trigonal crystal structure, no cleavage. The rough, weathered surface makes precise identification uncertain.
Formation & geological history
Typically forms when silica-rich fluids crystallize in veins or cavities in igneous and metamorphic rocks; quartz occurs in rocks of many geological ages.
Uses & applications
Quartz is used in glassmaking, electronics, abrasives, and decorative objects; attractive pieces may be polished for jewelry or collecting.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly occurs as a vein-filling mineral.
Field identification & locations
Look for hardness (it can scratch glass), lack of cleavage, and a white streak; common in quartz veins and many gravel deposits worldwide.
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Other mineral specimens
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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
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