Rastsvetaevite
A variety of Minerals
What is Rastsvetaevite?
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.
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Key Characteristics
Formation of Rastsvetaevite
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.
Quick Facts
Physical Properties
- Color
- Reddish-pink
- Hardness (Mohs)
- 5 - 6
- Density
- 2.84 g/cm³
- Streak
- white
Chemical Properties
- Chemical Formula
- Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 The originally reported formula: Na27K8Ca12Fe3Zr6Si4[Si3O9]4[Si9O27]4(O,OH,H2O)6Cl2
- Elements
- Ca, Cl, Fe, H, K, Na, O, Si, Zr
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