igneous
Graphic Granite (or Pegmatite)
Graphic Granite
Hardness: 6-7 (Mohs), Color: white to light gray with darker quartz, Luster: Vitreous, Crystal structure: Intergrowth, Cleavage: varies by mineral, Specific gravity: ~2.6
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Physical properties
Hardness: 6-7 (Mohs), Color: white to light gray with darker quartz, Luster: Vitreous, Crystal structure: Intergrowth, Cleavage: varies by mineral, Specific gravity: ~2.6
Formation & geological history
Forms in pegmatite dikes as an intergrowth of quartz and alkali feldspar crystals.
Uses & applications
Used in lapidary work for making cabochons, pendants, and ornamental objects.
Geological facts
The name comes from the runic or cuneiform-like patterns created by the quartz crystals embedded in the feldspar matrix.
Field identification & locations
Identify by the distinct, angular, writing-like patterns of quartz in a feldspar background. Commonly found in pegmatite deposits worldwide.
