metamorphic
Nuummite
Nuummite (mixture of Anthophyllite and Gedrite)
Hardness: 5.5-6.0; Color: Black with iridescent flashes of gold, blue, or green; Luster: Vitreous to sub-metallic; Crystal Structure: Orthorhombic; Cleavage: Perfect; Specific Gravity: 3.2-3.5
- Hardness
- 5
- Color
- Black with iridescent flashes of gold, blue, or green
- Luster
- Vitreous to sub-metallic
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Physical properties
Hardness: 5.5-6.0; Color: Black with iridescent flashes of gold, blue, or green; Luster: Vitreous to sub-metallic; Crystal Structure: Orthorhombic; Cleavage: Perfect; Specific Gravity: 3.2-3.5
Formation & geological history
Formed through the regional metamorphism of igneous rocks over 3 billion years ago (Archean age). It is one of the oldest rocks on Earth, primarily originating from the Nuuk region of Greenland.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons), ornamental carvings, and highly valued by mineral collectors and metaphysical practitioners.
Geological facts
Known as the 'Sorcerer's Stone,' it was discovered in 1982. It is distinctive for its 'labradorescence-like' flash, although it is geologically distinct from labradorite. It is found in remote, high-altitude glacial areas.
Field identification & locations
Identify by its dark, almost black opaque background with elongated metallic flakes or needles that shimmer when rotated. Found primarily in Greenland, but small deposits exist in Canada and Finland. Collectors look for high 'flash' density.
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