metamorphic
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
Hardness: 5.5-6 (Mohs scale); Color: Black or dark charcoal with iridescent flecks (blue, gold, green); Luster: Vitreous to sub-metallic; Crystal Structure: Orthorhombic; Specific Gravity: 2.8-3.4
- Hardness
- 5
- Luster
- Vitreous to sub-metallic
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 5.5-6 (Mohs scale); Color: Black or dark charcoal with iridescent flecks (blue, gold, green); Luster: Vitreous to sub-metallic; Crystal Structure: Orthorhombic; Specific Gravity: 2.8-3.4
Formation & geological history
Formed through high-grade regional metamorphism of igneous and sedimentary rocks. It is one of the oldest known minerals, originating from the Archean era (approx. 3 billion years old), primarily in the Nuuk region of Greenland.
Uses & applications
Predominantly used as a gemstone in jewelry (cabochons and pendants) and as a high-value collector's specimen for its unique iridescent 'fire'.
Geological facts
Nuummite is known as the 'Sorcerer's Stone' or the 'Philosopher's Stone' in metaphysical circles. It was first discovered in 1810 by mineralogist K. L. Giesecke and remains one of the rarest semi-precious stones due to the extreme conditions needed for its formation.
Field identification & locations
Identify in the field by its dark matrix containing thin, needle-like crystals that exhibit labradorescence (flashes of light) when turned. It is found in remote, high-pressure metamorphic belts; Greenland is the type locality, though similar materials are found in Norway and the USA.
More like this
