igneous
Granite Boulder
Plutonic felsic rock (Quartz-Feldspar)
AI-generated identification · may be incorrectHardness 6-7 Mohs; dull to crystalline luster; pinkish-tan to light gray with visible quartz, feldspar, and mica grains.
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Physical properties
Hardness 6-7 Mohs; dull to crystalline luster; pinkish-tan to light gray with visible quartz, feldspar, and mica grains.
Formation & geological history
Formed by slow underground cooling of felsic magma, later exposed and often transported as a glacial erratic.
Uses & applications
Crushed stone aggregate, architectural stone, landscaping boulders, and riprap.
Geological facts
Granite makes up a major portion of Earth's continental crust and frequently forms massive, weather-resistant boulders.
Field identification & locations
Identifiable by its coarse interlocking crystals of quartz and potassium feldspar; widespread in glaciated and mountainous terrains.
