igneous
Granite Pebble
Phaneritic plutonic rock (SiO2 primary)
Hardness: 6-7 (Mohs scale), Color: Pink, grey, and black mottled, Luster: Vitreous to dull, Crystal structure: Coarse-grained (phaneritic), Cleavage: None (distinct cleavage in feldspar components)
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Pink, grey, and black mottled, Luster: Vitreous to dull, Crystal structure: Coarse-grained (phaneritic), Cleavage: None (distinct cleavage in feldspar components)
Formation & geological history
Formed by the slow cooling of magma deep beneath the Earth's surface during various geological eras (often Precambrian or Paleozoic). The rounded shape indicates erosion by water or glacial action.
Uses & applications
Used in construction, countertops, monuments, and as decorative landscaping stones. Tumbled pebbles are used in crafts and aquariums.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is one of the hardest and most durable natural stones, which is why it is so prevalent in human construction.
Field identification & locations
Identify by its salt-and-pepper appearance with visible crystals of pink/white feldspar, clear quartz, and dark biotite or hornblende. Commonly found in riverbeds, beaches, and glacial till.
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