igneous
Granite Pebble (Pink Feldspar-rich)
Granite
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale; dull to sub-vitreous luster; pink, cream, grey, and black mottled color; coarse-grained phaneritic texture containing potassium feldspar (pink), quartz (clear/grey), and biotite/hornblende (dark spots); specific gravity approximately 2.65-2.75.
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Physical properties
Hardness 6-7 on Mohs scale; dull to sub-vitreous luster; pink, cream, grey, and black mottled color; coarse-grained phaneritic texture containing potassium feldspar (pink), quartz (clear/grey), and biotite/hornblende (dark spots); specific gravity approximately 2.65-2.75.
Formation & geological history
Formed through the slow cooling and crystallization of magma deep beneath the Earth's surface (plutonic intrusive igneous rock). Often rounded into pebbles through fluvial or coastal erosion.
Uses & applications
Commonly used as decorative stone, aquarium gravel, landscape rock, and crushed stone for aggregate construction.
Geological facts
Pink granite gets its distinctive color from abundant alkali/potassium feldspar (orthoclase or microcline). Granites make up a significant portion of the Earth's continental crust.
Field identification & locations
Identified by its visible crystalline grains of pink feldspar, quartz, and dark silicate minerals with no foliation. Extremely common worldwide in riverbeds, glaciated regions, and beaches.
