metamorphic
Weathered quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂); likely quartzite if the granular texture is recrystallized sandstone
AI-generated identification · may be incorrectWhite to cream, opaque, with brown iron-oxide staining and a sugary/granular texture; vitreous to dull luster. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65.
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Physical properties
White to cream, opaque, with brown iron-oxide staining and a sugary/granular texture; vitreous to dull luster. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65.
Formation & geological history
Likely formed from silica-rich sediment or hydrothermal quartz, later weathered and stained by oxidized iron. Exact geological age and classification cannot be determined from the photograph alone.
Uses & applications
Quartzite is used as construction aggregate, road stone, and decorative stone; clear quartz is collected and occasionally used in ornamental objects. This specimen appears mainly of collector interest.
Geological facts
The rusty brown patterns are probably limonite/goethite coatings along fractures, not necessarily metallic mineralization. Quartz should scratch ordinary glass and resist scratching by a steel knife.
Field identification & locations
Common in quartz veins, metamorphic terrains, and weathered gravel deposits worldwide; test hardness, inspect a fresh fracture, and use acid to check for carbonate coatings. Approximate value: $2–$15 as a common hand specimen, potentially $20–$50 if unusually aesthetic or locality-labeled.
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