mineral
Likely weathered feldspar-rich rock fragment
Uncertain; possibly orthoclase or microcline feldspar in a pegmatitic rock
AI-generated identification · may be incorrectTan to honey-brown, translucent at thin edges, with a vitreous to dull luster and blocky cleavage surfaces. Feldspar hardness is about 6–6.5 Mohs, with two cleavages near 90°; the image is partly obscured, limiting certainty.
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Physical properties
Tan to honey-brown, translucent at thin edges, with a vitreous to dull luster and blocky cleavage surfaces. Feldspar hardness is about 6–6.5 Mohs, with two cleavages near 90°; the image is partly obscured, limiting certainty.
Formation & geological history
Feldspar crystallizes from cooling silica-rich magma, commonly in granite and pegmatite; such rocks typically formed hundreds of millions to billions of years ago. Brown coloration may result from weathering or iron staining.
Uses & applications
Feldspar is used in glass, ceramics, abrasives, and occasionally as a decorative or collectible mineral. This rough fragment has little commercial value unless crystals or unusual color are present.
Geological facts
The apparent blocky shape and cleavage are consistent with feldspar, but quartz, calcite, or a weathered rock fragment remain possible without testing. A white streak, glass-scratch test, and cleavage inspection would improve identification.
Field identification & locations
Common in granite, pegmatite, gneiss, and feldspar-rich sands worldwide. Check for two cleavage planes, hardness sufficient to scratch glass, and lack of strong fizzing with dilute acid.
