igneous
Granite
Granite
Hardness: 6-7 (Mohs scale), Color: Pinkish-red, grey, and white phaneritic texture, Luster: Dull to vitreous, Crystal Structure: Equigranular/Phaneritic, Cleavage: None (though feldspar components show cleavage), Specific Gravity: 2.63 to 2.75
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Pinkish-red, grey, and white phaneritic texture, Luster: Dull to vitreous, Crystal Structure: Equigranular/Phaneritic, Cleavage: None (though feldspar components show cleavage), Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface (intrusive). This specific cobble appears to be water-worn, likely transported by glacial or fluvial processes during the Holocene or Pleistocene.
Uses & applications
Extensively used in construction, countertops, monuments, and as crushed stone for road aggregate. Quality specimens are polished for decorative purposes.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The red or pink color in this specimen is due to the presence of Potassium Feldspar (Orthoclase).
Field identification & locations
Identify by its interlocking visible crystals of quartz (clear/grey) and feldspar (pink/white). It is commonly found in mountainous regions or as river stones and glacial till in formerly glaciated areas.
