igneous

Dalmation Jasper (or Dalmation Stone)

Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)

Hardness: 5.5 to 7.0 Mohs; Color: Creamy white or gray with black-to-brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6 to 2.7.

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

Identified May 25, 2026More igneous →

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Physical properties

Hardness: 5.5 to 7.0 Mohs; Color: Creamy white or gray with black-to-brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6 to 2.7.

Formation & geological history

Formed through the cooling of silica-rich magma resulting in an igneous rock. It is primarily sourced from Chihuahua, Mexico, and its formation is associated with volcanic activity in the region.

Uses & applications

Commonly used in the jewelry industry for beads, cabochons, and decorative carvings. It is also popular in holistic practices and as a collector's specimen.

Geological facts

Despite being marketed as a 'jasper', it is technically an igneous rock (specifically an aplitic rock) rather than a sedimentary jasper. The black spots are minerals like Arfvedsonite, not tourmaline as often claimed.

Field identification & locations

Identify by its distinctive black 'polka dot' spots on a light gray-white base. It is mostly found in Mexico. Collectors should look for balanced spotting and high-quality polishing.

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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

Blue Apatite

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

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Magnetite

Magnetite (Fe3O4)

mineral