igneous
Granite Pebble
Granite (Phaneritic Quartz-Feldspar Rock)
Hardness: 6-7 on Mohs scale. Color: Mottled pink, white, and black. Luster: Dull (weathered) to vitreous (on fresh breaks). Crystal structure: Phaneritic/Coarse-grained. Cleavage: None (though constituent minerals like feldspar have it). Specific gravity: 2.63-2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled pink, white, and black
- Luster
- Dull (weathered) to vitreous (on fresh breaks)
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled pink, white, and black. Luster: Dull (weathered) to vitreous (on fresh breaks). Crystal structure: Phaneritic/Coarse-grained. Cleavage: None (though constituent minerals like feldspar have it). Specific gravity: 2.63-2.75.
Formation & geological history
Formed from the slow cooling and solidification of magma below the Earth's surface (intrusive). This specimen shows signs of water erosion (rounding), likely from a river or glacial transport during the Holocene or Pleistocene.
Uses & applications
Larger deposits are used for construction, countertops, and dimension stone. This small pebble is common for landscaping, aquarium gravel, or as a pocket stone for collectors.
Geological facts
Granite makes up the majority of the Earth's continental crust. It is primarily composed of quartz, orthoclase feldspar, and mica or amphibole minerals.
Field identification & locations
Identify by its 'salt and pepper' appearance and visible interlocking crystals. Common in mountain ranges and riverbeds. Look for the presence of pink feldspar and translucent quartz.
