mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectThe specimen appears white to translucent with a vitreous-to-pearly luster and irregular fracture; crystal faces are not clear in the photo. Quartz has Mohs hardness 7, a hexagonal crystal structure, no cleavage, and specific gravity about 2.65.
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Physical properties
The specimen appears white to translucent with a vitreous-to-pearly luster and irregular fracture; crystal faces are not clear in the photo. Quartz has Mohs hardness 7, a hexagonal crystal structure, no cleavage, and specific gravity about 2.65.
Formation & geological history
Likely a fragment of massive quartz formed when silica-rich fluids filled cracks and crystallized, or within an igneous or metamorphic rock. Quartz is widespread and occurs in rocks of many geological ages.
Uses & applications
Used in glassmaking, ceramics, electronics, and construction aggregate; attractive pieces are collected or fashioned into simple jewelry and ornaments.
Geological facts
Its milky appearance comes from tiny fluid or gas inclusions that scatter light. Quartz is one of Earth’s most abundant minerals.
Field identification & locations
Check for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; avoid testing a valuable specimen. Common in veins and many rock types worldwide, but the photo alone cannot confirm the exact variety.
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