Nuummite
Nuuk, Sermersooq, Greenland
3.14 carats
© Brian Kosnar - Mineral Classics
Nuummite is an unapproved name for a metamorphic rock that combines two amphiboles - Anthophyllite and Gedrite. A striking iridescence is caused by the interference of light between these crystals.
Nuummite is an attractive ornamental rock. The material is cut and polished into cabochons. The stones exhibit red, green and blue flashes of colour against a dark brown to black background.
Nuummite Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Nuummite Gemstones by Size
This table shows distribution of Nuummite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:3.14 cts
Heaviest:4.53 cts
Average:3.89 cts
Total photos:3
Do you have a larger Nuummite? Why not upload a photo?
| General Information | |||||||
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| Other Names/Trade Names: | |||||||
| Physical Properties of Nuummite | |||||||
| Mohs Hardness | 5.5 to 6, Gemstones of the world (2001) More from other references | ||||||
| Specific Gravity | 3.18 to 3.37, Gemmological Tables (2004) | ||||||
| Cleavage Quality | Perfect, Gemmological Tables (2004) | ||||||
| Optical Properties of Nuummite | |||||||
| Refractive Index | 1.635 to 1.663, Gemmological Tables (2004) | ||||||
| Optical Character | Biaxial/-, Gemmological Tables (2004) | ||||||
| Birefringence | 0.022, Gemmological Tables (2004) | ||||||
| Colour | |||||||
| Colour (General) | Dark gray, brownish-black. Blue, golden yellow and reddish iridescence, Gemmological Tables (2004) More from other references | ||||||
| Transparency | Opaque, Gemmological Tables (2004) More from other references | ||||||
| Crystallography of Nuummite | |||||||
| Crystal System | Orthorhombic, Gemmological Tables (2004) | ||||||
| Further Information | |||||||
| Mineral information: | Nuummite information at mindat.org | ||||||
| Significant Gem Localities | |||||||
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