igneous
Dalmatian Jasper
Microcrystalline Quartz with Arfvedsonite and Tourmaline inclusions
Hardness: 6.5-7 on the Mohs scale, Color: Cream, beige, or white with black or dark brown spots, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline quartz), Cleavage: None
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Cream, beige, or white with black or dark brown spots, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline quartz), Cleavage: None
Formation & geological history
Formed in igneous environments as a microcrystalline quartz variant where mineral inclusions of arfvedsonite or black tourmaline create the spotted Dalmatian-like pattern.
Uses & applications
Primarily used in jewelry making, cabochons, beads, and as an ornamental decorative stone.
Geological facts
Despite being commercially called 'jasper', geologically it is actually an igneous rock composed mainly of feldspar and quartz with dark amphibole inclusions.
Field identification & locations
Easily identifiable by its distinct cream-and-black spotted appearance. Commonly sourced from Mexico, particularly Chihuahua.
