igneous

Dalmation Stone (often called Dalmatian Jasper)

Antiperthite-rich Microgranite

Hardness: 5-7.5 (Mohs scale); Color: Creamy white to pale gray with distinct black/brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None (conchoidal fracture).

Hardness: 5-7
Color: Creamy white to pale gray with distinct black/brown spots
Luster: Vitreous to dull

Identified April 11, 2026More igneous →

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Physical properties

Hardness: 5-7.5 (Mohs scale); Color: Creamy white to pale gray with distinct black/brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None (conchoidal fracture).

Formation & geological history

Formed through the cooling and solidification of magma. The cream-colored groundmass consists of feldspar and quartz, while the black spots are formed by black tourmaline or arfvedsonite (amphibole) minerals.

Uses & applications

Predominantly used for jewelry (beads, cabochons), carvings, decorative ornaments, and as a popular semi-precious stone in metaphysical collecting.

Geological facts

Despite its common trade name, Dalmatian Jasper is geologically not a jasper (which is a form of chalcedony); it is actually an igneous rock, specifically a variety of granite.

Field identification & locations

Identify by its unique 'spotted dog' appearance. It is found exclusively in Chihuahua, Mexico. It is very durable and takes a high polish, making it a favorite for lapidary artists.

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

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Blue Apatite

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

mineral

Magnetite

Magnetite (Fe3O4)

mineral