igneous
Granitic Pegmatite with Graphic Texture
Graphic Granite (alkali feldspar and quartz intergrowth)
Hardness of 6-7 on the Mohs scale, predominantly pinkish-red feldspar intergrown with dark green to black minerals (such as tourmaline or biotite), vitreous to dull luster, crystalline structure with cuneiform or rune-like patterns, no distinct cleavage planes.
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Physical properties
Hardness of 6-7 on the Mohs scale, predominantly pinkish-red feldspar intergrown with dark green to black minerals (such as tourmaline or biotite), vitreous to dull luster, crystalline structure with cuneiform or rune-like patterns, no distinct cleavage planes.
Formation & geological history
Formed from slow-cooling magma deep within the Earth's crust during the pegmatitic stage of crystallization, typically Precambrian to Paleozoic in age.
Uses & applications
Used primarily as decorative specimens for mineral collectors, lapidary arts, and sometimes in architectural facings.
Geological facts
The distinctive graphic texture resembles ancient cuneiform or runic writing, which is why it is often referred to as graphic granite or rune granite.
Field identification & locations
Easily identified in the field by its characteristic runic or script-like intergrowths of light-colored minerals within a contrasting matrix. Commonly found in pegmatite dikes worldwide.
