igneous
Granite (Weathered)
Course-grained Intrusive Igneous Rock
Hardness: 6-7 (Mohs scale), Color: tan, brown/yellow oxide weathering, dark speckling from biotite/hornblende, Luster: dull to vitreous, Crystal Structure: Phaneritic (visible interlocking crystals), Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, brown/yellow oxide weathering, dark speckling from biotite/hornblende, Luster: dull to vitreous, Crystal Structure: Phaneritic (visible interlocking crystals), Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specimen shows a weathered 'rind' due to exposure to water and air, oxidizing the iron-bearing minerals and creating the brownish-yellow crust.
Uses & applications
Construction aggregate, dimension stone for countertops and monuments, and architectural veneers. Highly valued for durability and aesthetics.
Geological facts
Granite makes up a large portion of 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
Identify by visible interlocking grains of quartz (clear/grey) and feldspar (white/pink). Look for dark mica flakes. Found globally in mountainous regions and shield areas.
