metamorphic
Nuummite
Antophyllite-Gedrite (Orthorhombic amphibole)
Hardness: 5.5-6.0 on Mohs scale; Color: Black with iridescent flashes (labradorescence-like effect) of gold, blue, or green; Luster: Vitreous to sub-metallic; Crystal Structure: Orthorhombic; Cleavage: Perfect; Specific Gravity: 3.2 - 3.5.
- Hardness
- 5
- Luster
- Vitreous to sub-metallic
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Physical properties
Hardness: 5.5-6.0 on Mohs scale; Color: Black with iridescent flashes (labradorescence-like effect) 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 roughly 3 billion years ago (Archean age) through high-grade metamorphism of volcanic rocks. It is one of the oldest volcanic rocks known on Earth, found in highly metamorphosed environments.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons), ornamental carvings, and by crystal collectors for its aesthetic and perceived metaphysical properties.
Geological facts
Known as the 'Sorcerer's Stone,' it was first discovered in 1982 in the Nuuk region of Greenland. It is extremely rare because it is only found in a few locations globally and is difficult to mine due to the Arctic climate.
Field identification & locations
Identify by its characteristic 'shimmer' or flashes of color against a dark black background when rotated. Found almost exclusively in Greenland, though some related specimens are found in Canada and Finland. Collectors look for the density of color flashes.
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