igneous
Graphic Granite
Pegmatite (Quartz and Alkali Feldspar intergrowth)
Mohs hardness: 6 to 7; Color: Cream, tan, or pink with gray to brown markings; Luster: Vitreous to pearly; Crystal structure: Monoclinic/Hexagonal intergrowth; Cleavage: Perfect in two directions on feldspar faces.
- Hardness
- 6 to 7
- Color
- Cream, tan, or pink with gray to brown markings
- Luster
- Vitreous to pearly
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Physical properties
Mohs hardness: 6 to 7; Color: Cream, tan, or pink with gray to brown markings; Luster: Vitreous to pearly; Crystal structure: Monoclinic/Hexagonal intergrowth; Cleavage: Perfect in two directions on feldspar faces.
Formation & geological history
Formed during the late-stage crystallization of a granitic magma pegmatite. The unique patterns result from the simultaneous crystallization of quartz and feldspar, often found in ancient Precambrian or Paleozoic geological environments.
Uses & applications
Primarily used as a decorative stone, for cabochons in jewelry, as mineral specimens for collectors, and historically as a source of feldspar and quartz for ceramics.
Geological facts
The name 'graphic' comes from the Greek word 'graphos' (writing), because the quartz patterns resemble ancient cuneiform or hieroglyphic script. This texture is specifically called a 'runic' texture.
Field identification & locations
Identified by high-contrast, angular dark gray quartz inclusions within a lighter feldspar matrix. Commonly found in pegmatite fields in locations like Norway, Russia, and the United States (California, Maine).
