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Nuummite
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About Nuummite
Name:
The name Nuummite which means "derived from Nuuk" in Greenlandic was given to the amphibolitic rock type which was found by the geologist Peter W. Uitterdijk Appel in 1982, near Nuuk (Godthåb). Appel considered first the name nuukite, but renamed it to Nuummite, which in Greenlandish means "from Nuuk". The government granted the company Nuummite Nuuk A/S, wholly owned by Nuuk commune an exploration concession for Nuummite in the Nuuk area, as well as permission to manufacture and sell Nuummite jewelry. The company is based in Nuuk.
Among the samples stored in the Mineralogical Museum, Copenhagen, Denmark, collected by L. K. Giesecke in 1810, were samples of this rock from Nuuk.
Among the samples stored in the Mineralogical Museum, Copenhagen, Denmark, collected by L. K. Giesecke in 1810, were samples of this rock from Nuuk.
An unapproved name for a metamorphic rock with iridescent orthoamphiboles (Anthophyllite-Gedrite Series), the material is sometimes cut and polished as a gemstone.
Rodgers et al. (1996) investigated the material from one locality at the Simiuttat Island (Greenland) and found that the golden iridescent rocks consisted of <1-100 mm crystals of alternating submicron-thick lamellae of anthophyllite and gedrite. The morphology of the lamellae is consistent with an origin by spinodal decomposition (Champness and Rodgers, 2000).
Found in eight localities within 50 km of Nuuk, Greenland, all in orthoamphibolite pods within quartz-gneisses of the Akulleq terrane.
Note: There are some pseudo-nuummites from China and India (https://stapelvanstenen.nl/en/analysis-nuummite/).
Visit gemdat.org for gemological information about Nuummite.
Rodgers et al. (1996) investigated the material from one locality at the Simiuttat Island (Greenland) and found that the golden iridescent rocks consisted of <1-100 mm crystals of alternating submicron-thick lamellae of anthophyllite and gedrite. The morphology of the lamellae is consistent with an origin by spinodal decomposition (Champness and Rodgers, 2000).
Found in eight localities within 50 km of Nuuk, Greenland, all in orthoamphibolite pods within quartz-gneisses of the Akulleq terrane.
Note: There are some pseudo-nuummites from China and India (https://stapelvanstenen.nl/en/analysis-nuummite/).
Visit gemdat.org for gemological information about Nuummite.Unique Identifiers
Mindat ID:
30937
Long-form identifier:
mindat:1:1:30937:8
Similar Names
| Nimite | A valid IMA mineral species | Ni5Al(AlSi3O10)(OH)8 |
| Noumeite | A synonym of 'Garnierite' |
Synonyms of Nuummite
Common Associates
Associations Based on Photo Data:
| 5 photos of Nuummite associated with 'Anthophyllite-Gedrite Series' | |
| 1 photo of Nuummite associated with Anthophyllite | ◻Mg2Mg5(Si8O22)(OH)2 |
| 1 photo of Nuummite associated with Gedrite | ◻Mg2(Mg3Al2)(Al2Si6O22)(OH)2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Nuummite
mindat.org URL:
https://www.mindat.org/min-30937.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Nuummite
Reference List:
Appel, Peter W. Uitterdijk; Jensen, Aage (1987) A New Gem Material from Greenland: Iridescent Orthoamphibole. Gems & Gemology, 23 (1). 36-42 doi:10.5741/gems.23.1.36
Rodgers, K. A., Kinny, P. D., McGregor, V. R., Clark, G. R., Henderson, G. S. (1996) Iridescent anthophyllite-gedrite from Simiuttat, Nuuk district, southern West Greenland composition, exsolution, age. Mineralogical Magazine, 60 (403) 937-947 doi:10.1180/minmag.1996.060.403.08
Champness, P. E., Rodgers, K. A. (2000) The origin of iridescence in anthophyllite-gedrite from Simiuttat, Nuuk district, southern West Greenland. Mineralogical Magazine, 64 (5). 885-889 doi:10.1180/002646100549715
Kinnunen, Kari A. - Ed. (2017) Suomen Korukivet - Gemstones of Finland. Geological Survey of Finland. pp.169-174 - (on Finnish nuummite)
Localities for Nuummite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Finland | |
| ... +2 other references |
Greenland | |
| Arthur Thomas (2009) |
| Appel et al. (1987) | |
| Rodgers et al. (1996) |
Nuummite localities, Nuuk, Sermersooq, Greenland