igneous
Graphic Granite
Graphic Pegmatite
Hardness: 6-7 (Mohs); Color: Pinkish-white (feldspar) with grey-black (quartz); Luster: Vitreous to pearly; Crystal structure: Trigonal/Monoclinic intergrowth; Cleavage: Perfect on feldspar, none on quartz
- Hardness
- 6-7 (Mohs)
- Color
- Pinkish-white (feldspar) with grey-black (quartz)
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 (Mohs); Color: Pinkish-white (feldspar) with grey-black (quartz); Luster: Vitreous to pearly; Crystal structure: Trigonal/Monoclinic intergrowth; Cleavage: Perfect on feldspar, none on quartz
Formation & geological history
Formed in the late stages of magma crystallization within granite pegmatites. The distinct pattern is caused by the simultaneous, rhythmic growth of quartz and feldspar crystals. Typically associated with continental crust formation.
Uses & applications
Used primarily as decorative stone, countertops, gemstones (cabochons), and as a collector's specimen due to its unique aesthetic.
Geological facts
The name comes from the Ancient Greek 'grapho' (to write), because the dark quartz inclusions resemble ancient cuneiform script or Arabic writing. It is a textbook example of a mineral intergrowth texture.
Field identification & locations
Identify in the field by looking for 'runic' patterns where dark angular shapes (quartz) are embedded in a lighter matrix (orthoclase). Commonly found in pegmatite districts of Namibia, Russia, and the United States (Maine, South Dakota).
