igneous
Dalmatian Jasper
Microcrystalline Quartz with Arfvedsonite/Tourmaline inclusions
Hardness of 6.5 to 7 on the Mohs scale, cream or beige color with distinct black or dark brown spots, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, cream or beige color with distinct black or dark brown spots, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed from igneous precursor rocks rich in quartz and feldspar with inclusions of dark minerals like arfvedsonite. Often found in hydrothermal or volcanic environments.
Uses & applications
Widely used in the lapidary arts for tumbled stones, beads, cabochons, and ornamental carvings as well as in jewelry making.
Geological facts
Despite its common trade name 'Dalmatian Jasper', gemological testing shows it is not actually a true jasper, but rather a microcrystalline quartz mixed with other mineral inclusions that give it its distinctive spotted dog-like appearance.
Field identification & locations
Easily identified by its signature cream-colored background accented with contrasting black spots. Primarily sourced from Chihuahua, Mexico.
