metamorphic
Nuummite
Antigorite-Anthophyllite complex
Hardness: 5.5-6.0; Color: Charcoal grey to black with iridescent flashes of gold, blue, or green; Luster: Vitreous to sub-metallic; Crystal Structure: Orthorhombic/Monoclinic; Cleavage: Perfect in two directions.
- Hardness
- 5
- Luster
- Vitreous to sub-metallic
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Physical properties
Hardness: 5.5-6.0; Color: Charcoal grey to black with iridescent flashes of gold, blue, or green; Luster: Vitreous to sub-metallic; Crystal Structure: Orthorhombic/Monoclinic; Cleavage: Perfect in two directions.
Formation & geological history
Formed approximately 3 billion years ago (Archean age) through high-grade regional metamorphism. It is one of the oldest rocks on Earth, primarily found in the Nuuk region of Greenland.
Uses & applications
Used primarily in jewelry as cabochons, for ornamental carvings, and highly sought after by mineral collectors and metaphysical practitioners.
Geological facts
Nuummite was discovered in 1810 by the mineralogist K. L. Giesecke but was not scientifically defined until 1981. It is often called the 'Sorcerers Stone' in metaphysical circles.
Field identification & locations
Identify in the field by its dark, often waxy appearance and the characteristic 'flecks' or 'needles' of iridescent color that appear when moved under light. Found in remote areas of Greenland.
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