igneous
Granite Pebble
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
Hardness: 6-7 (Mohs scale), Color: light grey with salt-and-pepper specks, Luster: Dull (weathered) to vitreous (fresh), Structure: Massive/Granular, Cleavage: None in rock as a whole.
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Physical properties
Hardness: 6-7 (Mohs scale), Color: light grey with salt-and-pepper specks, Luster: Dull (weathered) to vitreous (fresh), Structure: Massive/Granular, Cleavage: None in rock as a whole.
Formation & geological history
Formed through the slow crystallization of magma below the Earth's surface. This specimen has been rounded into a pebble by mechanical weathering and water transport (river or coastal erosion).
Uses & applications
Used widely in construction (aggregate), decorative landscaping, and larger slabs for countertops and monuments.
Geological facts
Granite makes up the majority of the Earth's continental crust. It is one of the most durable and hard stones, which is why it is common to find it as rounded pebbles long after softer rocks have dissolved.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance and visible interlocking crystals of different colors. Commonly found in riverbeds, glacial tills, and mountainous terrains.
