Chinese
Name: 努烏邁特石
English Name:Nuummite
Chemical Composition:(Mg2)(Mg5)Si8O22(OH)2
Crystal System:Orthorhombic
Crystal Habit:Massive
Luster:Vitreous
Hardness:5.5 - 6.0
SG:2.85 - 3.57
RI:1.598 - 1.698 (Biaxial)
Related Chakra:Third-eye, Root
Astrological Sign:Sagittarius
Locality:Greenland, Africa
Colour: Dark gray, brownish-black. Blue, golden yellow and reddish iridescence
Source of 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".
Nuummite is an iridescent orthoamphbiole rock found in the Nuuk Distruct in south-west Greenland. It has only been known in the trade since 1983. However, the rock is believed to have been formed in the Late Archean period more than three billion years ago.
Nuummite is usually black in colour and opaque. It consists of two amphiboles, gedrite and anthophyllite, which form exsolution lamellae that give the rock its typical iridescence. Other common minerals in the rock are pyrite, pyrrhotite and chalcopyrite, which form shimmering yellow bands in polished specimens.
|