igneous
Graphic Granite
Pegmatitic Feldspar with Quartz intergrowths
Hardness: 6-7 (Mohs scale); Color: Typically tan, pink, or white matrix with black or grey 'writings'; Luster: Vitreous to pearly; Crystal structure: Monoclinic (feldspar) and Hexagonal (quartz); Specific gravity: 2.5-2.7
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Typically tan, pink, or white matrix with black or grey 'writings'; Luster: Vitreous to pearly; Crystal structure: Monoclinic (feldspar) and Hexagonal (quartz); Specific gravity: 2.5-2.7
Formation & geological history
Formed during the final stages of a magma's crystallization in a pegmatite run. The unique pattern occurs when quartz and feldspar crystallize simultaneously, creating a cuneiform-like intergrowth.
Uses & applications
Commonly used as decorative stone, in lapidary work for cabochons and beads, and as an architectural finishing material in high-end countertops or tiles.
Geological facts
The name comes from the Greek word 'graphos' (writing) because the quartz patterns resemble ancient cuneiform or hieroglyphic script. It is also sometimes called 'Hebrew Stone'.
Field identification & locations
Identified in the field by its distinct cuneiform-like patterns. Common in pegmatite districts globally, such as in California, Maine, Brazil, and Namibia. For collectors, look for high-contrast specimens with clear, sharp geometric patterns.
