metamorphic
Weathered quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂); likely quartzite if the grains are recrystallized and fused
AI-generated identification · may be incorrectWhite to cream, opaque, earthy to dull vitreous luster, granular texture, and irregular fracture; quartz has Mohs hardness 7 and no cleavage. Brown areas likely iron-oxide staining or weathering; the image does not resolve the texture well enough for certainty.
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Physical properties
White to cream, opaque, earthy to dull vitreous luster, granular texture, and irregular fracture; quartz has Mohs hardness 7 and no cleavage. Brown areas likely iron-oxide staining or weathering; the image does not resolve the texture well enough for certainty.
Formation & geological history
Quartzite forms when quartz-rich sandstone is metamorphosed under heat and pressure, commonly during mountain-building; its age depends on the source sandstone and metamorphic event. A weathered quartz vein or silicified rock is an alternative possibility.
Uses & applications
Quartzite is used as aggregate, building stone, paving material, and occasionally as a decorative stone; attractive pieces may be collected but are generally not gem-quality.
Geological facts
Quartzite commonly preserves faint bedding or original sandstone texture while developing a hard, fused surface. Iron oxides can produce cream, yellow, or brown staining.
Field identification & locations
Test with a steel file or knife: genuine quartz-rich material should resist scratching; inspect for fused sand grains versus distinct quartz crystals. Common in metamorphic mountain belts and quartz veins worldwide.
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