metamorphic
Nuummite
Orthoamphibole (Anthophyllite-Gedrite composition)
Hardness: 5.5-6.0; Color: Charcoal gray to black with iridescent flashes; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 2.85-3.57
- Hardness
- 5
- Color
- Charcoal gray to black with iridescent flashes
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 5.5-6.0; Color: Charcoal gray to black with iridescent flashes; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 2.85-3.57
Formation & geological history
Formed through high-grade metamorphism of volcanic rocks. It is one of the oldest rocks on Earth, dating back approximately 3 billion years (Archean era).
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads) and as a lapidary material for carvings and meditation stones.
Geological facts
Discovered in 1982 in Nuuk, Greenland, it is colloquially known as the 'Sorcerer's Stone' in metaphysical circles due to its ancient age and protective lore.
Field identification & locations
Identify by its unique iridescent flashes of gold, blue, or green (labradorescence-like) against a dark, fibrous background. Mostly found in the Nuuk region of Greenland.
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