igneous
Pegmatite, probably mica-rich
Granitic pegmatite composed mainly of quartz, feldspar, and mica (likely biotite and/or muscovite)
AI-generated identification · may be incorrectCoarse, interlocking crystals with shiny dark mica and lighter quartz or feldspar; visible minerals are typically Mohs 2–7, with vitreous to pearly luster. The photo is too close and unclear for confident mineral identification.
Identified More igneous →
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Physical properties
Coarse, interlocking crystals with shiny dark mica and lighter quartz or feldspar; visible minerals are typically Mohs 2–7, with vitreous to pearly luster. The photo is too close and unclear for confident mineral identification.
Formation & geological history
Pegmatite forms when water-rich residual magma crystallizes slowly, producing exceptionally large crystals; its age depends on the host intrusion and cannot be determined from the image.
Uses & applications
Collected as a mineral specimen; pegmatites can supply feldspar, quartz, mica, and specialty minerals, while attractive crystals may be used decoratively or in jewelry.
Geological facts
Pegmatites are known for unusually large crystals and can contain tourmaline, beryl, or other valuable minerals, though none can be confirmed here.
Field identification & locations
Look for coarse crystals with distinct mineral grains and mica’s platy, reflective cleavage; common in or near granitic intrusions worldwide. A clearer, wider photo would help distinguish the minerals.
