Tectosilicate (framework silicate), helvine group
Specific gravity: 2.33
Colour: Commonly red, also white to pink, bluish white, greenish white
Common impurities: Fe,Ga,Mg,Ca,K,H2O,S
Tugtupite occurs in alkali-rich, silica-poor intrusive igneous rocks (Webmin) associated with
nenadkevichite and beryllite
At the type locality, Tugtup Agtakôrfia, Tunulliarfik Fjord, Ilímaussaq complex, Kujalleq, Greenland, tugtupite occurs as replacements of chkalovite in hydrothermal veins cutting sodalite syenite and syenite (Mindat, HOM). Associated minerals include albite, analcime, aegirine, neptunite and pyrochlore (Dana).
At the Bolshoi Punkaruaiv Mountain and Sengischorr Mountain, Lovozersky District, Murmansk Oblast, Russia, tugtupite occurs as an alteration product in pegmatites in a differentiated alkaline massif (HOM).
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