igneous
Granite (Pink Orthoclase variety)
Phaneritic intrusive igneous rock (Quartz, Orthoclase, Plagioclase, and Mica)
Hardness: 6-7 (Mohs); Color: Pink to salmon-red (orthoclase feldspar), white/grey (quartz), and black (biotite/hornblende); Luster: Dull to vitreous; Crystal structure: Phaneritic (visible coarse grains); Cleavage: Perfect in two directions for feldspars.
- Hardness
- 6-7 (Mohs)
- Luster
- Dull to vitreous
Identified More igneous →
Explore Granite (Pink Orthoclase variety) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 (Mohs); Color: Pink to salmon-red (orthoclase feldspar), white/grey (quartz), and black (biotite/hornblende); Luster: Dull to vitreous; Crystal structure: Phaneritic (visible coarse grains); Cleavage: Perfect in two directions for feldspars.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep within the Earth's crust (plutonic). This specific rounded specimen has been smoothed by water erosion (alluvial) or glacial transport.
Uses & applications
Used extensively in construction for countertops, floor tiles, and monuments. Coarser varieties are used as decorative garden stones or crushed for road aggregate.
Geological facts
Granite makes up a significant portion of the Earth's continental crust. The pink color specifically indicates a high concentration of potassium feldspar (orthoclase).
Field identification & locations
Identify by its 'salt and pepper' speckled appearance and the distinct pink salmon hue. It is found globally in mountainous regions or glacial till. Collectors can find these easily in riverbeds and on beaches.
