igneous
Quartz-bearing pegmatitic rock, likely quartz–feldspar–mica specimen
Granitic pegmatite; primarily quartz (SiO₂), feldspar, and mica, with possible iron-oxide staining
AI-generated identification · may be incorrectHardness about 6–7 (quartz-rich portions), white to gray and pink, with a vitreous to pearly luster and irregular fracture; visible coarse, interlocking crystals and weathered cavities. Exact minerals cannot be confirmed from the photograph alone.
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Physical properties
Hardness about 6–7 (quartz-rich portions), white to gray and pink, with a vitreous to pearly luster and irregular fracture; visible coarse, interlocking crystals and weathered cavities. Exact minerals cannot be confirmed from the photograph alone.
Formation & geological history
Likely formed from the final, water-rich melt of a slowly cooling granitic magma, producing unusually coarse crystals; commonly Precambrian to Mesozoic depending on locality.
Uses & applications
Used chiefly as a teaching or collector specimen; pegmatites may host quartz, feldspar, mica, lithium minerals, and gemstones, while feldspar and quartz can have industrial applications.
Geological facts
The pink material is probably potassium feldspar, the translucent white material quartz, and dark flakes or patches may be biotite or iron-stained alteration.
Field identification & locations
Look for very coarse crystals, quartz’s glassy appearance, feldspar cleavage, and lack of rounded sedimentary layering; test cautiously with a steel file, as quartz should resist scratching. Common in granitic terrains worldwide, including Brazil, the United States, Canada, Madagascar, and India.
