metamorphic
Nuummite
Nuummite (Ortho-amphibole rock, primarily Anthophyllite and Gedrite)
Hardness: 5.5-6 (Mohs scale); Color: Dark brown to black with iridescent flashes of gold, blue, green, or red; Luster: Vitreous; Crystal Structure: Orthorhombic; Cleavage: Good; Specific Gravity: 2.85-3.57
- Hardness
- 5
- Luster
- Vitreous
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Physical properties
Hardness: 5.5-6 (Mohs scale); Color: Dark brown to black with iridescent flashes of gold, blue, green, or red; Luster: Vitreous; Crystal Structure: Orthorhombic; Cleavage: Good; Specific Gravity: 2.85-3.57
Formation & geological history
Formed through the metamorphic recrystallization of volcanic rocks. It is found in Greenland and dates back nearly 3.8 billion years to the Archean Eon, making it one of the oldest known rocks on Earth.
Uses & applications
Primarily used in high-end jewelry (cabochons), ornamental carvings, and as a popular specimen for gemstone collectors and metaphysical practitioners.
Geological facts
Nuummite was discovered in 1982 near Nuuk, Greenland, hence its name. It is often called the 'Sorcerer's Stone' due to its ancient origin and the unique way its colors flash when the light hits it, a phenomenon known as labradorescence-like iridescence.
Field identification & locations
Identify in the field by its dark matrix offset by distinct, needle-like iridescent flashes (chatoyancy). It is primarily found in the Nuuk region of Greenland, though similar material has been found in Finland and Canada. Collectors should look for the 'vibrant' shimmer against the black host rock.
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