metamorphic
Milky quartz-bearing rock, possibly quartzite
Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix
AI-generated identification · may be incorrectWhite to gray, vitreous-to-dull luster, massive granular texture, and no obvious cleavage; quartz hardness is Mohs 7, with typical specific gravity near 2.65. The specimen appears fractured and weathered, with possible darker mica or host-rock bands.
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Physical properties
White to gray, vitreous-to-dull luster, massive granular texture, and no obvious cleavage; quartz hardness is Mohs 7, with typical specific gravity near 2.65. The specimen appears fractured and weathered, with possible darker mica or host-rock bands.
Formation & geological history
Likely formed when quartz-rich sandstone recrystallized under heat and pressure, though the image alone cannot establish a precise identification or age. Quartzite commonly forms in metamorphic belts of Precambrian to younger age.
Uses & applications
Quartzite is used as crushed stone, aggregate, building stone, and decorative material; attractive pieces may be collected but this specimen appears low-grade and unpolished.
Geological facts
Quartz commonly produces conchoidal-looking fractures and scratches glass. A steel nail should not scratch quartz, while quartz can scratch ordinary glass.
Field identification & locations
Common in metamorphic mountain belts and river gravels worldwide. Confirm with a glass-scratch test, streak test, and close inspection for interlocking quartz grains; a hardness or acid test can distinguish carbonate-rich lookalikes.
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