igneous
Granite or Granitoid River Rock
Granite
AI-generated identification · may be incorrectHardness: 6-7 on Mohs scale. Color: mixed grey, black, and reddish/pinkish hues. Luster: dull to slightly shiny when polished or wet. Crystal structure: coarse-grained interlocking crystals (phaneritic) smoothed by water.
- Hardness
- 6-7 on Mohs scale
- Color
- mixed grey, black, and reddish/pinkish hues
- Luster
- dull to slightly shiny when polished or wet
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Physical properties
Hardness: 6-7 on Mohs scale. Color: mixed grey, black, and reddish/pinkish hues. Luster: dull to slightly shiny when polished or wet. Crystal structure: coarse-grained interlocking crystals (phaneritic) smoothed by water.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. This particular specimen has been smoothed and rounded by river or glacial transport over thousands of years.
Uses & applications
Commonly used in construction, landscaping, and sometimes collected as a decorative stone.
Geological facts
Granite is one of the most common rocks in the Earth's continental crust. The pinkish color is typically due to the presence of potassium feldspar.
Field identification & locations
Identifiable by its speckled, multi-colored appearance with visible interlocking grains (even when smoothed). Found in riverbeds, beaches, and glacial deposits globally.
