Igneous
Granite or Felsic Intrusive Rock (weathered)
Granite
Hardness: 6-7 (Mohs scale), Color: pinkish-brown, tan, with darker flecks, Luster: dull due to weathering, Crystal structure: phaneritic (visible crystals), Specific gravity: ~2.6-2.7
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Physical properties
Hardness: 6-7 (Mohs scale), Color: pinkish-brown, tan, with darker flecks, Luster: dull due to weathering, Crystal structure: phaneritic (visible crystals), Specific gravity: ~2.6-2.7
Formation & geological history
Formed from the slow cooling of felsic magma deep beneath the Earth's surface. This specimen has been heavily weathered and rounded, likely tumbled in a river or glacial environment.
Uses & applications
Commonly used in construction as dimension stone, for countertops, monuments, and as aggregate. Rounded stones like this might be used in landscaping.
Geological facts
Granite is one of the most common rocks forming the Earth's continental crust. This specific piece has been subjected to significant mechanical and potentially chemical weathering, obscuring individual crystals.
Field identification & locations
Identify in the field by its interlocking visible crystals (quartz, feldspar, mica/hornblende). Pervasive weathering forms grus. Found in continental volcanic arcs and collisional mountain belts.
