igneous
Granite Pebble
Granitoid (Plagioclase, Alkali feldspar, Quartz, Biotite/Amphibole)
Hardness of 6-7 on the Mohs scale, typically gray, pink, or white mottled appearance, dull to vitreous luster, phaneritic (coarse-grained) crystal structure, specific gravity around 2.65-2.75.
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Physical properties
Hardness of 6-7 on the Mohs scale, typically gray, pink, or white mottled appearance, dull to vitreous luster, phaneritic (coarse-grained) crystal structure, specific gravity around 2.65-2.75.
Formation & geological history
Formed from the slow crystallization of magma below the Earth's surface over millions of years, often exposed through tectonic uplift and subsequent weathering and erosion.
Uses & applications
Used in construction, monuments, countertops, paving, and landscaping.
Geological facts
Granite is the most common intrusive igneous rock in the Earth's continental crust and forms the core of many major mountain ranges.
Field identification & locations
Easily identified by its visible interlocking mineral grains of quartz, feldspar, and dark micas; commonly found in riverbeds and glacial deposits where rocks have been naturally tumbled and rounded.
