igneous
Polished pink granite or rhyolite pebble
Felsic silicate rock, likely quartz–feldspar-rich granite/rhyolite
AI-generated identification · may be incorrectPink-brown, mottled specimen with a dull-to-slightly waxy polished surface; likely quartz, potassium feldspar, plagioclase, and minor mica or iron oxides. Typical hardness is about 6–7 Mohs; granular texture and no obvious cleavage are expected.
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Physical properties
Pink-brown, mottled specimen with a dull-to-slightly waxy polished surface; likely quartz, potassium feldspar, plagioclase, and minor mica or iron oxides. Typical hardness is about 6–7 Mohs; granular texture and no obvious cleavage are expected.
Formation & geological history
Formed from silica-rich magma: granite crystallizes slowly underground, while rhyolite is its volcanic equivalent. Such material is generally Precambrian to Phanerozoic in age, though the specimen’s source cannot be dated from the image.
Uses & applications
Used for building stone, countertops, monuments, landscaping, and decorative polishing; small pieces have modest lapidary and collecting appeal.
Geological facts
The rounded, shaped appearance indicates tumbling or polishing, which obscures diagnostic grain boundaries. Its pink color commonly comes from iron-bearing potassium feldspar.
Field identification & locations
Look for visible interlocking grains, glassy quartz, and pink feldspar; a streak, acid, hardness, and magnified examination would distinguish granite from rhyolite and jasper. Common worldwide, especially in continental crust and glacial or stream gravels.
