igneous
Dalmatian Jasper (Dalmatian Stone)
Perthitic Feldspar with Arfvedsonite/Riebeckite
Hardness: 5.5-7 (Mohs scale); Color: Creamy white or pale yellow background with distinct black or dark green spots; Luster: Vitreous to dull; Crystal Structure: Monoclinic; Cleavage: None/Indistinct; Specific Gravity: 2.5-2.7
- Hardness
- 5
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 5.5-7 (Mohs scale); Color: Creamy white or pale yellow background with distinct black or dark green spots; Luster: Vitreous to dull; Crystal Structure: Monoclinic; Cleavage: None/Indistinct; Specific Gravity: 2.5-2.7
Formation & geological history
Formed through volcanic activity where magma cools and crystallizes. The 'spots' are actually inclusions of arfvedsonite or other amphibole minerals within a matrix of feldspar and quartz. It is primarily found in Chihuahua, Mexico.
Uses & applications
Primarily used for lapidary purposes, including tumbled stones, beads for jewelry, carvings, and as a decorative stone in crystal healing practices.
Geological facts
Despite being called a 'Jasper', it is technically an igneous rock rather than a variety of chalcedony. It was named for its resemblance to the coat of a Dalmatian dog.
Field identification & locations
Identify by its unique 'spotted' appearance which is distinct from many other minerals. It is almost exclusively mined in Mexico. Collectors should look for a smooth, matte to waxy finish when tumbled or polished.
