igneous

Dalmation Jasper (Dalmation Stone)

Perthitic feldspar-quartz-amphibole rock

Hardness: 5.5-7 (Mohs); Color: Cream or white base with black/brown spots; Luster: Vitreous to waxy (when polished); Crystal Structure: Monoclinic/Triclinic; Cleavage: None (conchoidal fracture).

Hardness: 5
Color: Cream or white base with black/brown spots
Luster: Vitreous to waxy (when polished)

Identified May 6, 2026More igneous →

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Physical properties

Hardness: 5.5-7 (Mohs); Color: Cream or white base with black/brown spots; Luster: Vitreous to waxy (when polished); Crystal Structure: Monoclinic/Triclinic; Cleavage: None (conchoidal fracture).

Formation & geological history

Formed through volcanic processes where magma cooled slowly, allowing crystals to form. The black spots are typically composed of arfvedsonite (amphibole) or tourmaline within the feldspar matrix.

Uses & applications

Primarily used in jewelry making (beads, cabochons), carvings, decorative ornaments, and widely for metaphysical or spiritual practices as a grounding stone.

Geological facts

Despite being called a 'Jasper' in the trade, it is technically an igneous rock composed of feldspar and quartz, not a traditional microcrystalline chalcedony jasper.

Field identification & locations

Identify by its distinctive black-on-white speckled appearance that mimics a Dalmatian dog breed. Commonly found in Chihuahua, Mexico. It is easily distinguishable in the field by its hardness and unique spotted patterns.

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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)

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Blue Apatite

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

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Magnetite

Magnetite (Fe3O4)

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