igneous

Dalmation Stone

Dalmation Jasper (Igneous microcrystalline quartz with arfvedsonite)

Hardness: 5.5-7 (Mohs scale); Color: Creamy white to pale gray with black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Specific Gravity: 2.58-2.91

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

Identified May 31, 2026More igneous →

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Physical properties

Hardness: 5.5-7 (Mohs scale); Color: Creamy white to pale gray with black or dark brown spots; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Specific Gravity: 2.58-2.91

Formation & geological history

Formed from the cooling of magma or lava that contains high amounts of silica. The black spots are inclusions of the mineral arfvedsonite. It is primarily found in Chihuahua, Mexico.

Uses & applications

Commonly used in the jewelry industry for beads, cabochons, and tumbled stones. Frequently used in metaphysical practices and as a decorative stone in mosaics or crafts.

Geological facts

Despite being called 'Dalmation Jasper', it is not actually a jasper (which is sedimentary) but an igneous rock. It was named for its resemblance to the Dalmation breed of dog.

Field identification & locations

Identify by its distinctive black tourmaline or arfvedsonite spots on a light background and its smooth, waxy texture when polished. Most specimens on the market originate from Mexico.

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

Dalmatian Jasper

Aplite with Arfvedsonite inclusions

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