mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, glassy-to-waxy luster, with irregular fracture and no cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The rough, massive appearance is consistent with milky quartz.
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Physical properties
White to translucent, glassy-to-waxy luster, with irregular fracture and no cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The rough, massive appearance is consistent with milky quartz.
Formation & geological history
Forms when silica-rich fluids crystallize in veins or cavities, and also occurs in igneous and metamorphic rocks. Quartz is widespread across geological ages; the specimen’s age cannot be determined from the image.
Uses & applications
Used as a silica source in glass and ceramics, and as a common ornamental or lapidary material; milky quartz is generally not prized for fine jewelry.
Geological facts
Its cloudy white appearance results from tiny fluid or gas inclusions that scatter light.
Field identification & locations
Look for hardness sufficient to scratch glass, lack of cleavage, and a pale streak. Common worldwide in quartz veins, pegmatites, and many rock types.
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Epidote
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Pegmatite with Tourmaline and Quartz
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Granite
Granite (Phaneritic intrusive igneous rock)
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