igneous
Graphic Granite
Graphic Granite (a variety of Pegmatite)
Hardness: 6-6.5 (Mohs scale); Color: Cream, white, or pink background with dark gray/smoky patterns; Luster: Vitreous to dull; Crystal structure: Monoclinic/Hexagonal intergrowth; Cleavage: Good in two directions (feldspar)
- Hardness
- 6-6
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-6.5 (Mohs scale); Color: Cream, white, or pink background with dark gray/smoky patterns; Luster: Vitreous to dull; Crystal structure: Monoclinic/Hexagonal intergrowth; Cleavage: Good in two directions (feldspar)
Formation & geological history
Formed through the simultaneous crystallization of quartz and alkali feldspar from a water-rich magma in the late stages of a pegmatite intrusion. The unique 'cuneiform' or writing-like pattern results from these minerals growing together.
Uses & applications
Used primarily as a decorative stone, in lapidary work for cabochons, and as a collector's specimen. In larger quantities, pegmatites are sources of industrial silica and feldspar.
Geological facts
The name comes from the Greek word 'graphos' (writing), as the dark quartz inclusions often resemble ancient cuneiform, Arabic, or hieroglyphic script. It is an classic example of mineral intergrowth.
Field identification & locations
Identify by looking for the distinct 'runic' or 'writing' pattern of darker quartz embedded in a lighter feldspar matrix. It is commonly found in pegmatite fields globally, notably in Russia, Madagascar, and the USA (California and South Dakota).
