Strunz classification 9.CO.10 Crystal system Trigonal | Dana classification 64.1b.1.2 | |
Category Silicate mineral, Cyclosilicate Formula
(repeating unit) Na27K8Ca12Fe3Zr6
Si4[Si3O9]4[Si9O27]4(O,OH,H2O)6Cl2 Crystal class Ditrigonal pyramidal (3m)
H-M symbol: (3m) | ||
Rastsveatevite is a rare mineral of the eudialyte group with the formula Na27K8Ca12Fe3Zr6Si4[Si3O9]4[Si9O27]4(O,OH,H2O)6Cl2. Its structure is modular. It is only the third member of the group after andrianovite and davinciite with essential (site-dominating) potassium. Potassium and sodium enter both N4 and M2 sites. The mineral is named after Russian crystallographer Ramiza K. Rastsvetaeva.
Occurrence and association
Rastsvetaevite was originally found in hyperagpaitic (ultra-alkaline) pegmatite at Mt. Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Associated minerals are aegirine, nacaphite, nepheline, natrite, schcherbakovite, sodalite, villiaumite, and rasvumite.
References
Rastsvetaevite Wikipedia(Text) CC BY-SA