Tugtupite is a beryllium aluminium tectosilicate. It also contains sodium and chlorine and has the formula Na4AlBeSi4O12Cl. Tugtupite is a member of the silica-deficient feldspathoid mineral group. It occurs in high alkali intrusive igneous rocks.
|Crystal class||Disphenoidal (4) |
H-M symbol: (4)
|Color||White, pink, crimson, blue, green|
|Mohs scale hardness||4|
Tugtupite occurs as vitreous, transparent to translucent masses of tetragonal crystals and is commonly found in white, pink, to crimson, and even blue and green. It has a Mohs hardness of 4 and a specific gravity of 2.36. It fluoresces crimson under ultraviolet radiation.
It was first found in 1962 at Tugtup agtakôrfia Ilimaussaq intrusive complex of southwest Greenland. It has also been found at Mont-Saint-Hilaire in Quebec and in the Lovozero Massif of the Kola Peninsula in Russia
The U.S. Geological Survey reports that in Nepal, tugtupite (as well as jasper and nephrite) were found extensively in most of the rivers from the Bardia to the Dang.
It is used as a gemstone.
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- Johnson, Gabe (October 2006), 2006 Minerals Yearbook (PDF), United States Geological Survey, p. 5, retrieved 17 May 2011
- Gemstones: Properties, Identification and Use By Arthur Thomas