mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, glassy-to-waxy luster, with irregular fracture and no obvious cleavage; Mohs hardness 7, hexagonal crystal structure, specific gravity about 2.65. The image appears to show a rough, naturally broken quartz piece.
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Physical properties
White to translucent, glassy-to-waxy luster, with irregular fracture and no obvious cleavage; Mohs hardness 7, hexagonal crystal structure, specific gravity about 2.65. The image appears to show a rough, naturally broken quartz piece.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, and is also common in igneous and metamorphic rocks. Quartz is widespread across geological ages; the specimen’s age cannot be determined from the photo.
Uses & applications
Used in glassmaking, ceramics, electronics, and construction aggregate; attractive pieces are collected or used in decorative crafts.
Geological facts
Quartz is one of Earth’s most abundant minerals and often occurs as vein material cutting through other rocks.
Field identification & locations
Identify by its hardness (it can scratch glass), glassy fracture, and lack of cleavage. Quartz is geologically plausible near 19°N, 100.7°W, but the locality alone cannot establish the identification.
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Granite
Granite (Phaneritic intrusive igneous rock)
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