Nuummite
A variety of Metamorphic
What is Nuummite?
A rock of volcanic origin, nuummite was probably formed 3 billion years ago. Although it's one of the oldest rocks on Earth, it wasn't discovered and described until the 1980s. Found only in Greenland, nuummite is very difficult to mine due to the climate and freezing temperatures. It's very rare and is sometimes polished into gemstones.
Uses & Applications
Nuummite is highly prized for ornamental uses due to its beautiful properties such as iridescence. It polishes well and is used to make unique and rare jewelry like beads and cabochons cut for pendants. Decorative objects are also carved from this material.
Optical Properties
- Refractive Index
- 1.635-1.663
- Birefringence
- 0.022
- Optical Character
- Biaxial negative
Nuummite Market Value Calculator
Estimate the market value of Nuummite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Nuummite Localities Map
See where Nuummite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Health & Safety Information
- ⚠️Harm Reason: Nuummite in powdered form can be toxic due to its Anthophyllite Asbestos content.
- ⚠️How to prevent the risks of Nuummite?
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Quick Facts
Physical Properties
- Color
- Black, gray, brownish-black with blue, red, green, violet, or golden-yellow iridescent flecks
- Hardness (Mohs)
- 5.5 - 6
- Density
- 2.85 - 3.57 g/cm³
- Streak
- Reddish gold
Chemical Properties
- Chemical Formula
- (Mg2)(Mg5)Si8O22(OH)2
Also Known As
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