igneous

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Hardness: 5.5–7; Color: Creamy white to pale gray background with black to brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.91

Hardness: 5
Luster: Vitreous to dull

Identified March 25, 2026More igneous →

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Physical properties

Hardness: 5.5–7; Color: Creamy white to pale gray background with black to brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.91

Formation & geological history

Formed from the solidification of silica-rich magma (aplite) where black spots of Arfvedsonite crystals grew within a matrix of quartz and feldspar; commonly associated with the Mesozoic era.

Uses & applications

Primarily used in jewelry (beads, cabochons), decorative carvings, pocket stones for collectors, and in metaphysical practices as a 'grounding' stone.

Geological facts

Although often marketed as 'Dalmatian Jasper', it is not a true jasper (sedimentary) but rather an igneous rock featuring black spots of the amphibole mineral Arfvedsonite rather than Tourmaline as previously thought.

Field identification & locations

Identify by its distinctive 'dog-like' spotted pattern and high hardness (cannot be scratched by a copper penny or steel knife easily). Found primarily in Chihuahua, Mexico. Collectors should look for high contrast between the cream base and dark spots.

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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