mineral
Milky quartz
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectWhite to cream, opaque to translucent, with a vitreous-to-waxy luster and uneven fracture; hardness 7 Mohs, trigonal crystal structure, no cleavage, specific gravity about 2.65. The specimen appears to be a rough, massive quartz fragment; identification from the image is approximate.
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Physical properties
White to cream, opaque to translucent, with a vitreous-to-waxy luster and uneven fracture; hardness 7 Mohs, trigonal crystal structure, no cleavage, specific gravity about 2.65. The specimen appears to be a rough, massive quartz fragment; identification from the image is approximate.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or during igneous and metamorphic processes. Quartz occurs in rocks of many geological ages.
Uses & applications
Commonly used as a silica source in glassmaking and ceramics; attractive pieces are collected or cut for ornamental objects and jewelry.
Geological facts
Quartz is one of Earth’s most abundant minerals and is notably resistant to weathering.
Field identification & locations
Look for hardness sufficient to scratch ordinary glass, a pale streak, and lack of cleavage; common worldwide in veins, pegmatites, and many rock types. This small rough piece would typically be worth about $1–$10 USD.
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Pegmatite with Tourmaline and Quartz
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igneous
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral