igneous
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
Hardness: 6-7 (Mohs scale); Color: Tan/cream with dark brown/black speckles; Luster: Dull/earthy (weathered) to vitreous; Crystal structure: Phaneritic (coarse-grained); Specific Gravity: 2.63-2.75
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan/cream with dark brown/black speckles
- Luster
- Dull/earthy (weathered) to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan/cream with dark brown/black speckles; Luster: Dull/earthy (weathered) to vitreous; Crystal structure: Phaneritic (coarse-grained); Specific Gravity: 2.63-2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This specimen shows significant rounding or weathering, likely from fluvial (river) or coastal erosion during the Holocene or older geological periods.
Uses & applications
Commonly used in large scale for construction, countertops, and monuments; as a pebble, it is used for landscaping, garden decor, and decorative gravel.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Most granite is very old, frequently dating back hundreds of millions or even billions of years to the Precambrian era.
Field identification & locations
Identify by its 'salt and pepper' appearance and visible interlocking crystals. It is found globally in mountainous and glaciated regions or riverbeds.
