igneous

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Hardness: 5.5-7 (Mohs scale); Color: White, cream, or light grey with black/dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6-2.7

Hardness: 5
Color: White, cream, or light grey with black/dark brown spots
Luster: Vitreous to dull

Identified March 11, 2026More igneous →

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Physical properties

Hardness: 5.5-7 (Mohs scale); Color: White, cream, or light grey with black/dark brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Specific gravity: 2.6-2.7

Formation & geological history

Formed from molten silica and minerals cooling within the Earth's crust; specifically a type of aplite, an igneous rock composed primarily of quartz, feldspar, and the black spots are crystals of the amphibole Arfvedsonite.

Uses & applications

Primarily used for ornamental purposes, gemstone carvings, cabochons for jewelry, and as therapy stones in spiritual or holistic practices.

Geological facts

Despite being called 'Dalmatian Jasper', it is not actually a jasper (which is sedimentary) but an igneous rock. The distinctive black spots were long thought to be tourmaline, but scientific analysis has confirmed they are actually arfvedsonite.

Field identification & locations

Identify in the field by the high contrast 'dog-like' spotting; it is almost exclusively found and mined in Chihuahua, Mexico. Collectors should look for even distribution of spots and a lack of surface cracks.

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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