igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
Hardness: 6-7 on Mohs scale; Color: Mottled white, grey, and black with slight orange staining; Luster: Dull to vitreous; Crystal Structure: Phaneritic (visible crystals); Composition: Quartz, Feldspar, and Mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled white, grey, and black with slight orange staining
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled white, grey, and black with slight orange staining; Luster: Dull to vitreous; Crystal Structure: Phaneritic (visible crystals); Composition: Quartz, Feldspar, and Mica.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep beneath the Earth's surface. This specific specimen has been Rounded by fluvial (river) or glacial erosion, likely over millions of years.
Uses & applications
In this small pebble form, it is primarily a decorative landscape stone or a teaching specimen. On a larger scale, granite is used for countertops, construction, and monuments.
Geological facts
Granite is one of the most common rocks in the Earth's continental crust. Its name comes from the Latin 'granum', meaning a grain, in reference to its coarse-grained structure.
Field identification & locations
Identified by the interlocking 'salt and pepper' appearance of its minerals. It can be found globally in mountainous regions, riverbeds, and glacial deposits. Look for the glint of mica flakes and the hardness of quartz crystals.
