igneous

Graphic Granite

Graphic Granite (Granite Pegmatite)

Hardness: 6-7 (Mohs scale); Color: White to cream feldspar background with dark grey to translucent quartz inclusions; Luster: Vitreous to dull; Crystal structure: Complex intergrowth; Cleavage: Good in feldspar phases; Specific Gravity: ~2.6.

Hardness: 6-7 (Mohs scale)
Luster: Vitreous to dull

Identified March 21, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling of silica-rich magma in pegmatites. The distinct pattern results from the simultaneous crystallization of quartz and alkali feldspar. Typical geological age ranges from billions to millions of years old depending on the batholith source.

Uses & applications

Used primarily as decorative stone, gemstones (cabochons), and as a collector's specimen. In larger quantities, it can be used for high-end countertops or architectural veneers.

Geological facts

The name comes from its resemblance to ancient cuneiform or runic writing. This runic texture is also referred to as 'Hebrew stone'. It is a classic textbook example of an igneous 'eutectic' texture where two minerals grow together rapidly.

Field identification & locations

Identify in the field by looking for 'L' or 'V' shaped quartz patterns embedded in a solid feldspar matrix. Often found in pegmatite dikes in mountain ranges such as the Urals, parts of California, or various locations in Brazil.

Other igneous specimens

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Magnetite

Magnetite (Fe3O4)

mineral