igneous
Graphic Granite / Pegmatite
Graphic Granite (Alkali Feldspar and Quartz)
Hardness: 6-7 on the Mohs scale. Color: White or pinkish base with dark grey to black or brownish cuneiform markings resembling ancient script. Luster: Vitreous to pearly on cleavage faces. Crystal structure: Pegmatitic texture with intergrown quartz and feldspar.
- Hardness
- 6-7 on the Mohs scale
- Luster
- Vitreous to pearly on cleavage faces
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Physical properties
Hardness: 6-7 on the Mohs scale. Color: White or pinkish base with dark grey to black or brownish cuneiform markings resembling ancient script. Luster: Vitreous to pearly on cleavage faces. Crystal structure: Pegmatitic texture with intergrown quartz and feldspar.
Formation & geological history
Formed in pegmatites from late-stage crystallization of granitic magma rich in water and volatiles, allowing large intergrown crystals to form.
Uses & applications
Used primarily as decorative stone, lapidary material, and for educational or mineral collecting purposes.
Geological facts
The name 'graphic' comes from the visual resemblance of the mineral intergrowth to ancient cuneiform or Hebrew writing.
Field identification & locations
Easily identified by the distinctive rune-like or script-like patterns of dark quartz within a light feldspar background. Commonly found in pegmatite veins worldwide.
