igneous
Quartz-rich feldspathic rock, possibly pegmatite
Granite/pegmatite; mainly quartz (SiO₂) and feldspar
AI-generated identification · may be incorrectCoarse-grained, cream-white and salmon-orange with a vitreous to dull luster; likely quartz and potassium feldspar, with hardness about 6–7 Mohs. The irregular broken surface prevents confident identification of cleavage or crystal structure from the image.
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Physical properties
Coarse-grained, cream-white and salmon-orange with a vitreous to dull luster; likely quartz and potassium feldspar, with hardness about 6–7 Mohs. The irregular broken surface prevents confident identification of cleavage or crystal structure from the image.
Formation & geological history
Likely formed by slow cooling of silica-rich magma, allowing large interlocking crystals; pegmatites crystallize in late-stage igneous veins, generally during Precambrian to Phanerozoic geologic events.
Uses & applications
Common granite is used for construction aggregate, monuments, countertops, and decorative stone; pegmatite specimens are collected for attractive feldspar, quartz, and accessory minerals.
Geological facts
The orange areas may be iron-stained potassium feldspar, while translucent white areas may be quartz. A definitive identification requires a fresh surface, hand lens, and hardness testing.
Field identification & locations
Look for interlocking visible grains, no foliation, and quartz that scratches glass but lacks cleavage; feldspar commonly shows two cleavage planes. Similar material occurs worldwide, especially in granitic terrains and pegmatite districts.
