igneous
Graphic Granite
Pegmatitic Granite
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale; consists of intergrown crystals of quartz and alkali feldspar; vitreous to pearly luster; lacks distinct external crystal faces due to simultaneous crystallization.
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Physical properties
Hardness 6-7 on Mohs scale; consists of intergrown crystals of quartz and alkali feldspar; vitreous to pearly luster; lacks distinct external crystal faces due to simultaneous crystallization.
Formation & geological history
Forms in late-stage pegmatitic magma crystallization environments where quartz and feldspar grow together rapidly.
Uses & applications
Used as an ornamental stone, educational specimen, and decorative lapidary material.
Geological facts
The intergrown quartz patterns often resemble ancient cuneiform or runic writing, which gives the rock its name.
Field identification & locations
Identified by distinct cuneiform-like graphic patterns of dark quartz within a lighter feldspar matrix; found globally in pegmatite dikes.
