igneous
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
Hardness: 6-7 on Mohs scale; Color: Creamy white to light gray base with black spots; Luster: Vitreous when polished; Crystal Structure: Microcrystalline; Specific Gravity: 2.58-2.91
- Hardness
- 6-7 on Mohs scale
- Color
- Creamy white to light gray base with black spots
- Luster
- Vitreous when polished
Identified More igneous →
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Creamy white to light gray base with black spots; Luster: Vitreous when polished; Crystal Structure: Microcrystalline; Specific Gravity: 2.58-2.91
Formation & geological history
An igneous rock primarily composed of feldspar, quartz, and other minerals that cooled rapidly. The black spots are typically composed of the rare amphibole mineral Arfvedsonite. It is mostly found in Chihuahua, Mexico.
Uses & applications
Primarily used for jewelry such as beads, cabochons, and decorative carvings or polished points. It is also a popular stone in metaphysical and crystal collecting circles.
Geological facts
Despite being widely marketed as 'Dalmatian Jasper', it is not a jasper at all but rather a type of igneous rock known as aplite. Its name comes from its visual similarity to the Dalmatian dog breed.
Field identification & locations
Identify by its distinctive black tourmaline or arfvedsonite spots on a white-to-cream background. Unlike man-made stones, the spots will be irregular and vary in size and distribution. Most commonly sourced from Mexico.
