mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, with a vitreous-to-dull luster and irregular fracture; Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The image shows a small, rough, pale specimen; exact identification is uncertain from appearance alone.
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Physical properties
White to translucent, with a vitreous-to-dull luster and irregular fracture; Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The image shows a small, rough, pale specimen; exact identification is uncertain from appearance alone.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or as a common component of igneous and metamorphic rocks. Quartz occurs in rocks of many geological ages.
Uses & applications
Used in glassmaking, electronics, abrasives, and construction; attractive pieces are collected or used decoratively.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure.
Field identification & locations
Look for hardness—quartz can scratch glass—and its lack of cleavage; common worldwide, especially in quartz veins and granitic terrains.
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Sandstone (with potential mineral staining/concretions)
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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)
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