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 More 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.
