igneous
Tumbled pink granite
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pink, gray, and dark speckled coloration; vitreous to dull luster; coarse interlocking crystals with no cleavage as a whole. The rounded shape indicates tumbling or polishing.
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Physical properties
Hardness about 6–7 Mohs; pink, gray, and dark speckled coloration; vitreous to dull luster; coarse interlocking crystals with no cleavage as a whole. The rounded shape indicates tumbling or polishing.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, commonly during Precambrian to Phanerozoic continental crust formation. Weathering and human tumbling produced the smooth pebble.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, landscaping rock, and inexpensive polished decorative specimens.
Geological facts
Pink color usually comes from potassium feldspar, while black flecks are commonly biotite or hornblende. Individual grains are visible, distinguishing granite from uniformly colored rhyolite.
Field identification & locations
Identify by visible interlocking quartz, pink feldspar, and dark mica grains; it is nonreactive or only weakly reactive with dilute acid and is much harder than calcite-rich rocks. Common worldwide, especially in continental mountain belts and shields.
