igneous
Pink Granite (Unakite-bearing Granite Pebble)
Granite (rich in Potassium Feldspar / Orthoclase)
Hardness: 6-7 on Mohs scale. Color: Mottled pink, reddish-brown, grey, and dark green. Luster: Dull to vitreous. Texture: Phaneritic, coarse-grained interlocking mineral crystals. Specific Gravity: ~2.63 - 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled pink, reddish-brown, grey, and dark green
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled pink, reddish-brown, grey, and dark green. Luster: Dull to vitreous. Texture: Phaneritic, coarse-grained interlocking mineral crystals. Specific Gravity: ~2.63 - 2.75.
Formation & geological history
Formed from the slow crystallization of felsic magma deep beneath the Earth's surface (plutonic environments). This specimen is a rounded pebble, showing evidence of mechanical weathering and transport by river, glacial, or beach action.
Uses & applications
Commonly used as crushed stone in construction, decorative landscaping, paving, and building facades. Rounded pebbles are also collected for rock tumbling and decorative gravel.
Geological facts
The distinct pinkish-red hue in this pebble comes from potassium feldspar (orthoclase or microcline). The dark grey and greenish spots are quartz and altered amphibole/biotite minerals.
Field identification & locations
Identified by its visible interlocking grain structure containing abundant pink feldspar, glassy grey quartz, and dark silicate minerals. Extremely common worldwide in continental crust regions, gravel pits, and glaciated landscapes.
