igneous
Dalmatian Jasper
Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)
Hardness: 6.5-7 (Mohs); Color: Creamy white to pale gray background with distinct black or brown spots; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: Approx. 2.6
- Hardness
- 6
- Luster
- Dull to vitreous
Identified More igneous →
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Creamy white to pale gray background with distinct black or brown spots; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: Approx. 2.6
Formation & geological history
Dalmatian Jasper is an igneous rock that forms from the slow cooling of silica-rich magma, allowing small spots of iron-dominant amphibole (arfvedsonite) to crystallize within a feldspar and quartz matrix. Original volcanic formations are primarily found in Chihuahua, Mexico.
Uses & applications
Used extensively in the jewelry industry for beads, cabochons, and carvings. It is also a popular stone for decorative items, tumbled pocket stones, and metaphysical collection.
Geological facts
Despite being commonly called 'Jasper' (which is a sedimentary/microcrystalline quartz rock), dalmatian jasper is actually an igneous rock composed of feldspar and quartz. The black spots are minerals like arfvedsonite or tourmaline rather than manganese oxide.
Field identification & locations
Identify in the field by its characteristic 'spotted dog' appearance, high hardness (cannot be scratched by a steel knife), and lack of reaction to acid. It is almost exclusively sourced from Mexico.
