igneous
Graphic Granite
Pegmatitic Granite (Quartz and Microcline K-Feldspar mixture)
Hardness: 6-7 Mohs; Color: White to light pink with dark gray or black runic patterns; Luster: Vitreous to pearly; Crystal structure: Monoclinic/Hexagonal intergrowth; Cleavage: Perfect in feldspar sections.
- Hardness
- 6-7 Mohs
- Color
- White to light pink with dark gray or black runic patterns
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 Mohs; Color: White to light pink with dark gray or black runic patterns; Luster: Vitreous to pearly; Crystal structure: Monoclinic/Hexagonal intergrowth; Cleavage: Perfect in feldspar sections.
Formation & geological history
Formed from the simultaneous crystallization of quartz and alkali feldspar from a silica-rich melt in pegmatite veins. The quartz grows in specific orientations within the feldspar crystals during the final cooling stages of a magma chamber.
Uses & applications
Primarily used as a decorative stone, in jewelry (cabochons), as an ornamental building material, and as a popular specimen for mineral collectors due to its unique texturing.
Geological facts
The name 'graphic' comes from the Greek 'graphos' (writing), because the dark quartz inclusions look like ancient cuneiform or hieroglyphic script. It is sometimes called 'Hebrew Stone' for the same reason.
Field identification & locations
Look for a light-colored rock where the darker minerals form patterns resembling alphabet letters or 'V' and 'L' shapes. Commonly found in pegmatite fields globally, including Maine, South Dakota, and Namibia.
