igneous

Dalmation Stone (Dalmation Jasper)

Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)

Hardness: 5.5 - 7 on Mohs scale; Color: Creamy white or tan base with black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.58 - 2.91

Hardness: 5
Color: Creamy white or tan base with black or dark brown spots
Luster: Vitreous to dull

Identified March 18, 2026More igneous →

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Physical properties

Hardness: 5.5 - 7 on Mohs scale; Color: Creamy white or tan base with black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.58 - 2.91

Formation & geological history

Formed through volcanic activity where magma cools and igneous material solidifies. The distinct spots are typically inclusions of the mineral Arfvedsonite. It is primarily found in Mexico.

Uses & applications

Predominantly used for ornamental purposes including carvings (like the dinosaur skull pictured), spheres, tumbled stones, and cabochons for jewelry. It is a popular 'healing stone' in metaphysical circles.

Geological facts

Despite being called 'Jasper', it is technically an igneous rock rather than a sedimentary chalcedony. The black spots are often mistaken for Tourmaline, but are chemically arfvedsonite, a sodium amphibole mineral.

Field identification & locations

Identify by its unique 'dalmatian dog' pattern of black spots on a cream base. In the field, look for lack of transparency and a smooth, waxy feel when polished. Most commercial specimens originate from Chihuahua, Mexico.

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

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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

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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Blue Apatite

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

mineral

Magnetite

Magnetite (Fe3O4)

mineral