igneous
Granite Pebble (Pink/Orthoclase Granite)
Granite
Hardness: 6-7 on Mohs scale. Color: Mixture of salmon-pink (K-feldspar), translucent gray (quartz), and black (biotite/amphibole). Luster: Vitreous to dull. Texture: Phaneritic (coarse-grained intrusive igneous). Specific gravity: ~2.65-2.75.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
Identified More igneous →
Explore Granite Pebble (Pink/Orthoclase Granite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 on Mohs scale. Color: Mixture of salmon-pink (K-feldspar), translucent gray (quartz), and black (biotite/amphibole). Luster: Vitreous to dull. Texture: Phaneritic (coarse-grained intrusive igneous). Specific gravity: ~2.65-2.75.
Formation & geological history
Formed by the slow crystallization of silica-rich felsic magma deep beneath the Earth's surface (plutonic environment). Smooth, rounded shape indicates transport and erosion by water or ice.
Uses & applications
Used widely in construction, countertops, monuments, and decorative gravel. Polished pebbles are collected or used in landscaping and crafts.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The pink color is specifically due to potassium feldspar (orthoclase), while the dark grains are usually biotite mica or hornblende.
Field identification & locations
Identified by its speckled texture with distinct interlocking crystals of pink feldspar, quartz, and dark minerals. Common along rivers, beaches, and glaciated regions worldwide.
