igneous
Dalmation Stone (frequently called Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock
Hardness: 6.5–7 (Mohs scale); Color: White, cream, or pale grey with black/brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline aggregate; Cleavage: None; Specific gravity: 2.58–2.91.
- Hardness
- 6
- Color
- White, cream, or pale grey with black/brown spots
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: White, cream, or pale grey with black/brown spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline aggregate; Cleavage: None; Specific gravity: 2.58–2.91.
Formation & geological history
Formed through volcanic activity and rapid cooling. It consists primarily of feldspar and quartz (the white matrix) with distinct black spots of arfvedsonite (an amphibole mineral) rather than tourmaline. It is found in Mesozoic to Cenozoic geological formations.
Uses & applications
Primarily used in the lapidary arts for beads, cabochons, tumbled stones, and decorative carvings. It is popular in jewelry making due to its unique pattern and durability.
Geological facts
Despite being called 'Dalmatian Jasper' in the trade, it is technically an igneous rock rather than a jasper (which is a form of chalcedony). The black spots were long misidentified as tourmaline but were later confirmed to be the rare mineral arfvedsonite.
Field identification & locations
Identify in the field by the high contrast 'dalmatian dog' spotting. It is almost exclusively mined in Chihuahua, Mexico. For collectors, it is easily identified by its hardness (cannot be scratched by a steel knife) and its lack of transparency.
