metamorphic
Weathered quartz-rich rock, possibly quartzite or granitic fragment
Indeterminate; likely quartzite (mostly SiO₂) or quartz-bearing granitoid
AI-generated identification · may be incorrectSmall irregular tan-brown specimen with a pale gray-white crystalline patch, earthy/dull to weakly vitreous luster, and no visible cleavage. Estimated hardness 6–7 Mohs; specific gravity roughly 2.6–2.7, but the image is insufficient for confident measurement.
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Physical properties
Small irregular tan-brown specimen with a pale gray-white crystalline patch, earthy/dull to weakly vitreous luster, and no visible cleavage. Estimated hardness 6–7 Mohs; specific gravity roughly 2.6–2.7, but the image is insufficient for confident measurement.
Formation & geological history
Could represent metamorphosed sandstone (quartzite) or weathered igneous rock; age and formation environment cannot be determined visually. Brown coloration likely comes from iron-oxide staining and surface weathering.
Uses & applications
Quartzite is used as crushed stone, aggregate, building stone, and occasionally as a decorative material; an ordinary fragment has negligible commercial value.
Geological facts
Quartz-rich rocks commonly scratch glass and do not fizz with dilute hydrochloric acid unless carbonate minerals are present. The white area may be massive quartz, but a close inspection is needed to distinguish it from calcite or feldspar.
Field identification & locations
Common in quartz-rich gravels, mountain belts, and weathered outcrops worldwide. Test hardness, streak, acid reaction, and grain texture; a fresh broken surface would improve identification.
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