igneous
Graphic Granite
Graphic Granite (Granitic Pegmatite)
Hardness: 6-6.5 (Mohs scale), Color: Creamy white with grayish-brown patterns, Luster: Vitreous to pearly, Structure: Crystalline intergrowth of Quartz and Feldspar.
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs scale), Color: Creamy white with grayish-brown patterns, Luster: Vitreous to pearly, Structure: Crystalline intergrowth of Quartz and Feldspar.
Formation & geological history
Formed through the simultaneous crystallization of quartz and potassium feldspar from a silica-rich melt within a pegmatite, often dating back to the Precambrian or Paleozoic eras.
Uses & applications
Used primarily as decorative stone, for building facades, cabochons in jewelry, and as a popular specimen for mineral collectors.
Geological facts
The name comes from the Greek word 'graphos' (to write) because the quartz patterns resemble ancient cuneiform or runes.
Field identification & locations
Identify by looking for dark, angular quartz shapes embedded in a lighter feldspar matrix. Commonly found in pegmatite-rich regions like the Black Hills of South Dakota or parts of Scandinavia.
