igneous
Pink Granite (with Potassic Feldspar and Quartz)
Felsic Intrusive Igneous Rock (Granite)
Hardness: 6-7 on Mohs scale; Color: Pink, white, and grey; Luster: Vitreous to pearly; Crystal Structure: Phaneritic (visible interlocking crystals); Cleavage: Perfect on feldspar grains, none on quartz; Specific Gravity: 2.63 to 2.75
- Hardness
- 6-7 on Mohs scale
- Color
- Pink, white, and grey
- Luster
- Vitreous to pearly
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Pink, white, and grey; Luster: Vitreous to pearly; Crystal Structure: Phaneritic (visible interlocking crystals); Cleavage: Perfect on feldspar grains, none on quartz; Specific Gravity: 2.63 to 2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface. This intrusive process allows large crystals to form. Specimens can range from Precambrian to Cenozoic in age, commonly found in continental crustal batholiths.
Uses & applications
Used extensively in construction (countertops, tiles, paving), monuments, and as crushed stone for road base. Pure pieces are also collected as mineral samples.
Geological facts
Granite makes up the majority of the Earth's continental crust. Mount Rushmore is carved into a massive granite batholith. The pink color specifically comes from an abundance of potassium feldspar (orthoclase).
Field identification & locations
Identify in the field by its 'salt and pepper' or speckled appearance with visible crystals that are interlocked rather than cemented. Commonly found in mountainous regions or glacial till. Collectors should look for large, well-defined feldspar phenocrysts.
