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
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Physical properties
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.
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.
