igneous

Dalmatian Stone

Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock

Hardness: 5-7.5 (Mohs scale); Color: Cream or beige background with black spots; Luster: Vitreous to dull; Crystal structure: Phaneritic/granular (complex mixture of Quartz, Feldspar, and Tourmaline); Specific gravity: Approx 2.6 - 2.8.

Hardness: 5-7
Color: Cream or beige background with black spots
Luster: Vitreous to dull

Identified March 5, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow cooling of magma deep within the Earth's crust, primarily composed of microcline feldspar and quartz with black inclusions of arfvedsonite or black tourmaline. Most commercially available specimens originate from the Chihuahua region of Mexico.

Uses & applications

Predominantly used for ornamental purposes, tumbling, lapidary jewelry (beads, cabochons), and as a popular 'pocket stone' in metaphysical and collecting circles.

Geological facts

Despite being widely marketed as 'Dalmatian Jasper,' it is technically an igneous rock rather than a jasper (which is a sedimentary/metamorphic chert). The black spots are often mistaken for Hornblende but are actually the amphibole Arfvedsonite.

Field identification & locations

Identify by its distinctive polka-dot pattern resembling a Dalmatian dog. Found primarily in Mexico. In the field, look for its high silica content and lack of true jasper graininess; it is more crystalline under a loupe.

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

Blue Apatite

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

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Magnetite

Magnetite (Fe3O4)

mineral