metamorphic
Weathered quartz-rich rock, possibly quartzite or quartz vein material
Quartz (SiO₂), likely with feldspar, mica, and iron-oxide staining
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale gray, cream, tan, and brown; mostly vitreous to dull luster with granular texture. The rounded surface obscures original fabric, and no clear cleavage is visible.
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Physical properties
Hardness about 6–7 Mohs; pale gray, cream, tan, and brown; mostly vitreous to dull luster with granular texture. The rounded surface obscures original fabric, and no clear cleavage is visible.
Formation & geological history
Likely formed from quartz-rich metamorphic or hydrothermal material, then rounded and weathered by erosion; precise age and setting cannot be determined from the photograph.
Uses & applications
Ordinary specimens have little industrial value, though quartzite is used as aggregate, building stone, and decorative stone. Attractive pieces may be used for display or lapidary work.
Geological facts
The brown coloration commonly comes from iron oxides such as limonite or hematite coating fractures and grain boundaries. The specimen appears naturally weathered or stream-rounded.
Field identification & locations
Look for very high scratch resistance, abundant quartz grains, and a lack of visible flat cleavage surfaces; a steel file may scratch softer feldspar but generally not quartz. Common sources include quartz veins, metamorphic terrains, and gravel deposits worldwide.
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