igneous
Graphic Granite
Graphic Granite (Pegmatite)
Hardness: 6-6.5 (Mohs scale); Color: White or cream feldspar matrix with gray/black smokey quartz intergrowths; Luster: Vitreous to pearly; Crystal structure: Monoclinic (feldspar) and Hexagonal (quartz); Cleavage: Perfect in two directions for feldspar.
- Hardness
- 6-6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 (Mohs scale); Color: White or cream feldspar matrix with gray/black smokey quartz intergrowths; Luster: Vitreous to pearly; Crystal structure: Monoclinic (feldspar) and Hexagonal (quartz); Cleavage: Perfect in two directions for feldspar.
Formation & geological history
Formed during the final stages of magma crystallization in granitic pegmatites. The unique 'cuneiform' or 'hieroglyphic' pattern results from the simultaneous growth of quartz and orthoclase feldspar crystals.
Uses & applications
Used primarily as a decorative stone in jewelry (cabochons), or as ornamental slabs for countertops and carvings. It is a prized specimen for mineral collectors due to its unique pattern.
Geological facts
The name 'graphic' comes from the Greek word 'graphos' (writing), as the dark quartz patterns resemble ancient cuneiform or Arabic script. It is a classic example of a 'runic' texture in geology.
Field identification & locations
Can be identified by the distinct angular, dark quartz shapes embedded in a lighter feldspar matrix. Commonly found in pegmatite districts such as those in Russia, Madagascar, and the United States (California and Maine).
