igneous
Granite Pebble (Pink Granite)
Phaneritic Igneous Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
Hardness: 6-7 Mohs; Color: Mottled pink/orange, gray, and black; Luster: Dull to vitreous (glassy) depending on crystal faces; Crystal Structure: Phaneritic (coarse-grained visible crystals); Cleavage: Irregular fracture overall, though feldspar grains show perfect cleavage planes.
- Hardness
- 6-7 Mohs
- Color
- Mottled pink/orange, gray, and black
- Luster
- Dull to vitreous (glassy) depending on crystal faces
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled pink/orange, gray, and black; Luster: Dull to vitreous (glassy) depending on crystal faces; Crystal Structure: Phaneritic (coarse-grained visible crystals); Cleavage: Irregular fracture overall, though feldspar grains show perfect cleavage planes.
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). This specimen shows rounded edges indicating it was likely weathered and transported by water in a river or glacial environment. Geological age can range from millions to billions of years (Precambrian to Cenozoic).
Uses & applications
Used extensively in construction (crushed stone), decorative architecture (countertops, monuments), and as abrasive material. High-quality tumbled pieces are common in rock collections.
Geological facts
Granite makes up the majority of the Earth's continental crust. Its pink color is caused by an abundance of potassium feldspar (orthoclase).
Field identification & locations
Identify in the field by its 'salt and pepper' or multicrystalline mottled appearance and extreme hardness (will scratch glass). Commonly found in mountain ranges, glacial till, and riverbeds globally.
