igneous
Granite Fragment
Felsic Plutonic Rock (Granite)
Hardness: 6-7 (Mohs scale), Color: speckled greyish-tan with white and black grains, Luster: dull to vitreous, Crystal structure: phaneritic (visible crystals), Cleavage: poor/irregular
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Physical properties
Hardness: 6-7 (Mohs scale), Color: speckled greyish-tan with white and black grains, Luster: dull to vitreous, Crystal structure: phaneritic (visible crystals), Cleavage: poor/irregular
Formation & geological history
Formed by the slow cooling of silica-rich magma beneath the Earth's surface. This specimen appears to be a small weathered fragment likely eroded from a larger pluton or used as construction aggregate.
Uses & applications
Commonly used as construction aggregate, road base, architectural stone, and for decorative landscaping surfaces like the concrete walkway it sits upon.
Geological facts
Granite makes up a large portion of the Earth's continental crust. It is extremely resistant to weathering and erosion, which is why it is used as a primary building material.
Field identification & locations
Identified by its salt-and-pepper appearance and grains of quartz and feldspar. Found globally in continental mountain ranges and shield regions.
