Formula: Na4BeAlSi4O12Cl
Tectosilicate (framework silicate), helvine group
Crystal System: Tetragonal
Specific gravity: 2.33 measured, 2.34 calculated
Hardness: 4
Streak: White
Colour: Commonly red, also white to pink, bluish white, greenish white
Common impurities: Fe,Ga,Mg,Ca,K,H2O,S
Environments
Pegmatites
Hydrothermal environments
Tugtupite occurs in alkali-rich, silica-poor intrusive igneous rocks (Webmin) associated with
albite, analcime,
aegirine, natrolite,
chkalovite, lithian
mica, epistolite,
niobophyllite, monazite,
rhabdophane, gerasimovskite,
nenadkevichite and beryllite
(HOM).
Localities
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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