igneous
Likely quartz-rich pegmatite (weathered, mica-bearing)
Granitic pegmatite, composed mainly of quartz and feldspar with possible mica; exact minerals cannot be confirmed from the photo
AI-generated identification · may be incorrectCoarse, irregularly crystalline specimen with pale pink-tan and gray areas and a dull, weathered surface. Quartz is Mohs 7; feldspars about 6; mica about 2–3. Grain boundaries and luster are not clear enough to identify individual minerals confidently.
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Physical properties
Coarse, irregularly crystalline specimen with pale pink-tan and gray areas and a dull, weathered surface. Quartz is Mohs 7; feldspars about 6; mica about 2–3. Grain boundaries and luster are not clear enough to identify individual minerals confidently.
Formation & geological history
Pegmatite forms when silica-rich magma crystallizes slowly from water-rich residual melt, often in veins near granitic intrusions. The rock cannot be dated from the image; pegmatites in the region may be associated with ancient intrusive rocks.
Uses & applications
Pegmatites can provide feldspar, quartz, mica, and locally lithium- or gemstone-bearing minerals; attractive pieces may be collected, but this specimen appears unpolished and not gem-grade.
Geological facts
The coarse texture is characteristic of pegmatite, whose crystals can grow exceptionally large. The visual identification is tentative because the specimen is weathered and lacks a fresh, diagnostic surface.
Field identification & locations
The reported coordinates are in Afghanistan’s Hindu Kush region, where intrusive and metamorphic rocks occur, making a granitic pegmatite plausible. Check a fresh break for interlocking quartz and feldspar; a hand lens or mineral tests would improve identification.
