metamorphic
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
Hardness: 5.5-6 on Mohs scale. Color: Black to dark brown with iridescent labradorescent-like flashes. Luster: Vitreous to sub-metallic. Crystal structure: Orthorhombic. Cleavage: Distinct in two directions. Gravity: 2.8-3.5.
- Hardness
- 5
- Luster
- Vitreous to sub-metallic
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Physical properties
Hardness: 5.5-6 on Mohs scale. Color: Black to dark brown with iridescent labradorescent-like flashes. Luster: Vitreous to sub-metallic. Crystal structure: Orthorhombic. Cleavage: Distinct in two directions. Gravity: 2.8-3.5.
Formation & geological history
Metamorphic rock formed over 3 billion years ago (Archean era). It is one of the oldest volcanic rocks on Earth, transformed through intense heat and pressure into thin, alternating mineral plates that create its signature iridescence.
Uses & applications
Primarily used as a gemstone for cabochons, jewelry, and ornamental carvings. It is highly valued in the metaphysical community as a 'Sorcerer's Stone.'
Geological facts
First discovered in 1982 near Nuuk, Greenland. It is distinct because its colors (gold, blue, green, or red flashes) are caused by the interference of light within microscopic layers of different amphibole minerals.
Field identification & locations
Identify in the field by its dark, almost coal-like base color and 'specks' or 'flecks' of iridescent light that appear when rotated. Found almost exclusively in the Nuuk region of Greenland, with rare similar materials in Finland.
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