metamorphic
Milky quartz-rich vein rock (likely quartzite or silicified host rock)
Quartz, SiO₂; possibly quartzite with iron-oxide and minor feldspar/clay inclusions
AI-generated identification · may be incorrectHardness about 7 Mohs; white to translucent gray with vitreous-to-waxy luster, massive interlocking quartz, and no obvious cleavage. The rusty brown areas likely represent iron oxides; apparent fractures and weathering obscure the original texture.
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Physical properties
Hardness about 7 Mohs; white to translucent gray with vitreous-to-waxy luster, massive interlocking quartz, and no obvious cleavage. The rusty brown areas likely represent iron oxides; apparent fractures and weathering obscure the original texture.
Formation & geological history
Formed when silica-rich fluids filled fractures or when sandstone was metamorphosed and recrystallized; the exact geological age cannot be determined from the image. Common in hydrothermal veins and metamorphic terrains of many ages.
Uses & applications
Used as aggregate, ornamental stone, silica feedstock, and occasionally as a lapidary material; generally unsuitable for fine jewelry unless it takes a good polish.
Geological facts
Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering. A steel file should not scratch fresh quartz, while quartz will scratch ordinary glass.
Field identification & locations
Look for glassy fracture surfaces, strong hardness, and white translucent quartz masses; acid testing is usually negative. Common in vein outcrops, metamorphic belts, and gravel deposits worldwide.
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