metamorphic
Weathered quartz-rich rock, likely quartzite or quartz vein
Quartzite; predominantly quartz (SiO₂), possibly iron-oxide stained
AI-generated identification · may be incorrectWhite to cream, massive and granular, with glassy to dull luster and rusty orange-brown staining from iron oxides. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity around 2.65; the image does not clearly show original grain boundaries, so quartz vein material is also possible.
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Physical properties
White to cream, massive and granular, with glassy to dull luster and rusty orange-brown staining from iron oxides. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity around 2.65; the image does not clearly show original grain boundaries, so quartz vein material is also possible.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized during regional metamorphism; quartz veins form when silica-rich fluids fill fractures. Precise age cannot be determined visually and depends on the local bedrock.
Uses & applications
Crushed quartzite is used for aggregate, roadstone, and occasionally silica; attractive pieces may be used as decorative stone or lapidary material, though this weathered specimen has little gem value.
Geological facts
The rusty coloration is typical of limonite/goethite weathering around iron-bearing minerals or fractures. A steel file should barely scratch it, while quartzite can scratch ordinary glass.
Field identification & locations
Common in metamorphic terrains and quartz-vein exposures worldwide; test for abundant quartz, hardness, and a sugary texture, while acid testing helps rule out carbonate rocks. Field identification is tentative because soil obscures the specimen.
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