mineral
Small quartz-rich stone, possibly iron-stained quartz or jasper
Quartz (SiO₂), potentially with iron-oxide inclusions
AI-generated identification · may be incorrectTan-brown, irregular fragment with a dull to slightly vitreous luster and apparent granular texture; quartz hardness is Mohs 7, with no obvious cleavage and white streak. The image is insufficient to confirm crystal structure or specific gravity.
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Physical properties
Tan-brown, irregular fragment with a dull to slightly vitreous luster and apparent granular texture; quartz hardness is Mohs 7, with no obvious cleavage and white streak. The image is insufficient to confirm crystal structure or specific gravity.
Formation & geological history
Likely formed in a silica-rich vein or weathered host rock, with brown coloration from iron oxides; age cannot be determined visually. Quartz-bearing material occurs in igneous, metamorphic, and sedimentary environments worldwide.
Uses & applications
Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive pieces may be collected or used decoratively, but this specimen appears low-grade.
Geological facts
The brown coloration may reflect hematite or limonite coatings rather than a distinct brown quartz variety. A scratch test with steel or glass can help distinguish quartz from softer look-alikes.
Field identification & locations
Common localities include hydrothermal veins and quartz-rich gravels globally. Confirm by testing hardness, observing fracture (quartz commonly conchoidal), and checking for acid reaction, which should be absent.
