mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, vitreous luster, uneven fracture and no cleavage; hardness 7 Mohs, trigonal crystal system, specific gravity about 2.65.
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Physical properties
White to translucent, vitreous luster, uneven fracture and no cleavage; hardness 7 Mohs, trigonal crystal system, specific gravity about 2.65.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or during cooling of silica-rich magma. Quartz occurs in rocks of many ages and geological settings.
Uses & applications
Used for ornamental carvings, jewelry, and collecting; quartz is also important in glassmaking and electronics, though this rough specimen is mainly decorative.
Geological facts
Milky appearance comes from tiny fluid or gas inclusions that scatter light.
Field identification & locations
Identify by its glassy shine, hardness (it scratches ordinary glass), and lack of cleavage. Common worldwide in quartz veins, pegmatites, and many igneous and metamorphic rocks.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
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Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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