igneous
Tumbled feldspar-rich granite
Granite, chiefly quartz and feldspar with dark mica or amphibole
AI-generated identification · may be incorrectPolished, rounded pebble with mottled tan, cream, and dark gray-brown grains. Granite’s component minerals are typically Mohs 6–7 (quartz) and 6 (feldspar); vitreous quartz and feldspar grains have no visible cleavage at this scale.
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Physical properties
Polished, rounded pebble with mottled tan, cream, and dark gray-brown grains. Granite’s component minerals are typically Mohs 6–7 (quartz) and 6 (feldspar); vitreous quartz and feldspar grains have no visible cleavage at this scale.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing coarse crystals to grow; granites occur in crustal rocks of many ages. This pebble was naturally rounded or shaped and polished by tumbling.
Uses & applications
Used as dimension stone, countertops, monuments, aggregate, and decorative or collectible tumbled stone.
Geological facts
Granite is a coarse-grained intrusive igneous rock, though tumbling makes its original grain boundaries less distinct.
Field identification & locations
Look for a speckled mixture of light quartz and feldspar with darker minerals; common in continental crust and river or glacial gravels. The image supports a granite-like identification, but exact composition cannot be confirmed visually.
