igneous
Graphic Granite (or Rapakivi-textured Granite)
Alkali feldspar granite
Hardness of 6-7 on the Mohs scale, predominantly pink to reddish groundmass composed of potassium feldspar with embedded dark green to black tabular crystals of hornblende or biotite. Luster is vitreous to dull, phaneritic (coarse-grained) texture.
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Physical properties
Hardness of 6-7 on the Mohs scale, predominantly pink to reddish groundmass composed of potassium feldspar with embedded dark green to black tabular crystals of hornblende or biotite. Luster is vitreous to dull, phaneritic (coarse-grained) texture.
Formation & geological history
Formed from the slow cooling and crystallization of silica-rich magma deep within the Earth's crust (plutonic igneous rock).
Uses & applications
Used widely as a dimension stone in construction, architectural facades, countertops, monuments, and as a specimen for rock and mineral collectors.
Geological facts
Granite is the most common rock of the Earth's continental crust. The pink color typically comes from an abundance of potassium feldspar (orthoclase).
Field identification & locations
Easily identified in the field by its distinct interlocking crystalline texture showing pink feldspar and contrasting dark amphibole or mica minerals. Found worldwide in continental shields and mountain ranges.
