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
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Nuummite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
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
- ⚠️Nuummite in powdered form can be toxic due to its Anthophyllite Asbestos content.
- ⚠️Nuummite is safe to handle except in powder form. If you plan to cut or polish nuummite, it's advisable to wear a dust mask to avoid inhaling any dust. Asbestos fibers are hazardous when inhaled, as they can lead to serious lung disease.
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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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Nuummite FAQs
How do I identify Nuummite?
Nuummite can be identified by its hardness of 5.5 - 6 on the Mohs scale, Black color. Look for these key characteristics when examining specimens.
What color is Nuummite?
Nuummite typically appears in Black, gray, brownish-black with blue, red, green, violet, or golden-yellow iridescent flecks. Color can vary depending on impurities and formation conditions.
How hard is Nuummite?
Nuummite has a hardness of 5.5 - 6 on the Mohs scale. This gives it moderate hardness.
