igneous
Quartz-rich pegmatitic rock, likely pink granite or quartzite
Probable pink granite/pegmatite; chiefly quartz (SiO₂), potassium feldspar, and minor mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale pink, white, and gray granular texture with vitreous-to-dull luster. Crystals are interlocking and lack obvious cleavage as a whole, though feldspar shows cleavage.
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Physical properties
Hardness about 6–7 Mohs; pale pink, white, and gray granular texture with vitreous-to-dull luster. Crystals are interlocking and lack obvious cleavage as a whole, though feldspar shows cleavage.
Formation & geological history
Likely formed by slow cooling of silica-rich magma, possibly in a pegmatite or granitic intrusion, during Precambrian to younger geologic time. The rough, weathered surface reflects natural erosion.
Uses & applications
Common granite is used for crushed stone, aggregate, countertops, and building stone; attractive pieces may be used as lapidary or teaching specimens. This small, unpolished fragment has minimal commercial value.
Geological facts
The pink color commonly comes from potassium feldspar, while translucent gray grains are quartz. A steel knife generally will not scratch quartz, but may scratch weathered feldspar or soft alteration products.
Field identification & locations
Look for visible interlocking quartz and pink feldspar, irregular fracture, and a speckled rather than layered texture; fizzing with dilute acid is typically absent. Common in granitic terrains worldwide, including the United States, Canada, India, and Scandinavia.
