mineral
Milky quartz
Quartz (SiO₂), commonly called milky quartz
AI-generated identification · may be incorrectWhite to translucent, vitreous luster, massive rather than visibly crystal-faced; Mohs hardness 7, with no cleavage and conchoidal fracture. Quartz has a trigonal crystal structure; specific gravity is about 2.65.
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Physical properties
White to translucent, vitreous luster, massive rather than visibly crystal-faced; Mohs hardness 7, with no cleavage and conchoidal fracture. Quartz has a trigonal crystal structure; specific gravity is about 2.65.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or during cooling of silica-rich magma; it occurs in rocks of many geological ages.
Uses & applications
Used as a silica source in glass and other industries; attractive pieces are collected or used decoratively.
Geological facts
Its cloudy appearance results from microscopic fluid or gas inclusions and internal fractures.
Field identification & locations
Common worldwide in quartz veins, pegmatites, and metamorphic rocks. Identify by its hardness, glassy luster, and lack of cleavage; this image appears to show a rough, massive specimen.
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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
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