igneous
Granite Pebble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
Hardness: 6-7 on Mohs scale; Color: Mottled grey, white, and dark minerals; Luster: Dull (weathered) to vitreous (on fresh breaks); Crystal structure: Phaneritic (visible interlocking crystals); Specific gravity: 2.63 - 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled grey, white, and dark minerals
- Luster
- Dull (weathered) to vitreous (on fresh breaks)
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled grey, white, and dark minerals; Luster: Dull (weathered) to vitreous (on fresh breaks); Crystal structure: Phaneritic (visible interlocking crystals); Specific gravity: 2.63 - 2.75.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specimen appears water-worn, smoothed by alluvial or glacial transport processes after being exposed by erosion.
Uses & applications
Crushed stone for road base, Dimension stone for countertops and monuments, and architectural aggregate. This specific pebble size is often used in landscaping and xeriscaping.
Geological facts
Granite makes up a large part of the Earth's continental crust. It is essentially the 'signature' rock of our planet, as it is found in such abundance only on Earth compared to other planets in our solar system.
Field identification & locations
Identify by its 'salt and pepper' appearance and hardness (it will scratch glass). Commonly found in riverbeds, glacial tills, and mountain ranges. Collectors should look for unique mineral inclusions like tourmaline or garnet within the matrix.
