igneous
Graphic Granite
Pegmatitic Quartz-Feldspar Granite
Hardness: 6-7 (Mohs scale), Color: Pink/cream (feldspar) with grey/smoky (quartz), Luster: Vitreous to pearly, Crystal structure: Cuneiform (wedge-shaped) patterns.
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Pink/cream (feldspar) with grey/smoky (quartz), Luster: Vitreous to pearly, Crystal structure: Cuneiform (wedge-shaped) patterns.
Formation & geological history
Formed from the simultaneous crystallization of quartz and alkali feldspar within granite pegmatites. The specific interlocking texture suggests a eutectic point solidification from a water-rich magma.
Uses & applications
Primarily used as a ornamental stone, for jewelry (cabochons), and as a collector's specimen due to its unique appearance.
Geological facts
The name 'graphic' comes from the Greek word 'graphos', meaning writing, because the dark quartz patterns resemble ancient petroglyphs or cuneiform script.
Field identification & locations
Identify in the field by looking for the 'script-like' black/grey quartz embedded in a solid feldspar matrix. Commonly found in pegmatite districts of Scandinavia, Madagascar, and the USA (California/Maine).
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