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, and specific gravity about 2.65. The specimen appears to be a rough, massive piece; identification from the image is visual only.
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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, and specific gravity about 2.65. The specimen appears to be a rough, massive piece; identification from the image is visual only.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or during igneous and metamorphic processes. Quartz is widespread in rocks of many geological ages.
Uses & applications
Used as a silica source in glass and ceramics, as an ornamental or lapidary material, and in mineral collections; this cloudy rough material is generally not gem-grade.
Geological facts
The milky appearance is caused by microscopic fluid or gas inclusions that scatter light.
Field identification & locations
Common in quartz veins, pegmatites, and many host rocks worldwide; its hardness and lack of cleavage help distinguish it from softer white minerals. A simple scratch test against glass can support identification, though avoid damaging valuable specimens.
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Mineral