igneous
Graphic Granite
Pegmatitic Granite
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale, featuring pale quartz and alkali feldspar background with stark black tourmaline or biotite cuneiform intergrowths. It has a vitreous to pearly luster and phaneritic crystal structure.
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Physical properties
Hardness of 6-7 on the Mohs scale, featuring pale quartz and alkali feldspar background with stark black tourmaline or biotite cuneiform intergrowths. It has a vitreous to pearly luster and phaneritic crystal structure.
Formation & geological history
Formed through the extremely slow cooling of water-rich magma in pegmatite dikes, allowing large, intergrown crystals to develop.
Uses & applications
Used primarily as a decorative lapidary material, in ornamental carvings, and as a sought-after specimen for mineral collections.
Geological facts
The distinct cuneiform mineral patterns closely resemble ancient cuneiform or runes, giving the rock its descriptive name.
Field identification & locations
Identified by its striking graphic runes of dark minerals embedded in a lighter feldspar and quartz matrix; commonly found worldwide in pegmatite fields.
