metamorphic
Weathered quartz-bearing rock, possibly sandstone or quartzite
Provisional: quartzite (mostly SiO₂); could alternatively be iron-stained quartz sandstone
AI-generated identification · may be incorrectTan-yellow, granular, and dull to slightly glassy with scattered quartz grains; likely Mohs hardness 6.5–7, no obvious cleavage, and medium-to-high specific gravity (~2.6). The image lacks enough detail for confident mineral identification.
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Physical properties
Tan-yellow, granular, and dull to slightly glassy with scattered quartz grains; likely Mohs hardness 6.5–7, no obvious cleavage, and medium-to-high specific gravity (~2.6). The image lacks enough detail for confident mineral identification.
Formation & geological history
If quartzite, it formed when quartz-rich sandstone was compacted and recrystallized during metamorphism; if sandstone, it is a sedimentary rock cemented by silica or iron oxides. An exact age and formation locality cannot be determined from the photograph.
Uses & applications
Common quartzite is used as aggregate, road stone, building stone, and landscaping material; attractive pieces may be collected or polished. It has little gem value unless unusually colorful or patterned.
Geological facts
The yellow-brown coloration is likely caused by iron oxides such as limonite or hematite. A quartzite specimen typically breaks across grains, whereas sandstone more readily reveals distinct sand grains and porous surfaces.
Field identification & locations
Common in mountain belts and exposed metamorphic terrains worldwide; test with a steel knife or glass—quartz-rich material should resist scratching—and inspect a fresh edge for fused versus loose grains. Estimated value: $1–$15 as a common specimen, or $20–$50 if attractive and polished.
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