igneous
Feldspar-rich Granite
Granite (primarily Orthoclase and Quartz)
Hardness: 6-7 (Mohs), Color: buff, tan, and dark green/grey, Luster: vitreous to dull, Crystal structure: phaneritic (visible crystals), Specific gravity: 2.6-2.7
Identified More igneous →
Explore Feldspar-rich Granite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 (Mohs), Color: buff, tan, and dark green/grey, Luster: vitreous to dull, Crystal structure: phaneritic (visible crystals), Specific gravity: 2.6-2.7
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. This specimen shows significant weathering and oxidation of the feldspar component.
Uses & applications
Used extensively in construction as dimension stone, countertops, and aggregate. Coarser varieties are collected for mineral study.
Geological facts
Granite makes up the majority of Earth's continental crust. Buff and tan colors often indicate weathering of potassium feldspars into clay minerals.
Field identification & locations
Identify by the presence of interlocking crystals and its extreme hardness (cannot be scratched by a steel knife). Commonly found in mountainous regions or glacial deposits.
