igneous
Large granite boulder
Granite, a coarse-grained intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectGray, speckled, and massive with a rough, granular texture; quartz hardness is 7 Mohs, feldspar 6, and mica 2–3. Crystals are interlocking and visible, with no regular cleavage at the whole-rock scale.
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Physical properties
Gray, speckled, and massive with a rough, granular texture; quartz hardness is 7 Mohs, feldspar 6, and mica 2–3. Crystals are interlocking and visible, with no regular cleavage at the whole-rock scale.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing crystals to grow. Its exact age and geological setting cannot be determined from the image.
Uses & applications
Granite is widely used for building stone, paving, monuments, countertops, and landscaping; this boulder appears to be a natural landscape feature.
Geological facts
Granite’s visible grains result from slow cooling beneath Earth’s surface; weathering can round exposed boulders into corestones.
Field identification & locations
Look for interlocking light quartz and feldspar grains with darker mica or other minerals. Granite is common in continental mountain belts and exposed bedrock regions; a boulder’s precise source requires local geological context.
