igneous
Rounded pink granite pebble
Granite, chiefly quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectPink, fine-to-medium-grained, dull to slightly sparkly; interlocking crystals with no cleavage as a whole. Individual minerals are typically quartz (Mohs 7), feldspar (6), and biotite (2.5–3); specific gravity about 2.6–2.7.
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Physical properties
Pink, fine-to-medium-grained, dull to slightly sparkly; interlocking crystals with no cleavage as a whole. Individual minerals are typically quartz (Mohs 7), feldspar (6), and biotite (2.5–3); specific gravity about 2.6–2.7.
Formation & geological history
Slow cooling of silica-rich magma produced the crystalline granite, commonly during Precambrian to Phanerozoic continental mountain-building. Its rounded shape and smoothed surface indicate stream, beach, or glacial transport and abrasion.
Uses & applications
Used widely as crushed aggregate, building stone, paving, monuments, and decorative countertops; this small pebble has mainly educational or ornamental value.
Geological facts
The pink color commonly comes from potassium feldspar, while dark flecks are likely biotite or other mafic minerals. The image cannot confirm whether the rock is granite, pink granodiorite, or a related granitoid.
Field identification & locations
Identify it by visible interlocking pale grains, pink feldspar, translucent gray quartz, and scattered dark mica; a hand lens and dilute acid test help distinguish it from carbonate rocks. Common worldwide, especially in exposed continental shields and mountain belts.
