raslakite
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Raslakite is a rare mineral of the eudialyte group with the chemical formula . This formula is based on the original one, and is extended to show the presence of cyclic silicate groups. The additional silicon and oxygen shown in separation from the cyclic groups (in parentheses) are in fact connected with two 9-fold rings. The mineral has lowered symmetry (space group R3, instead of more specific for the group R3m one), similarly to some other eudialyte-group members: aqualite, labyrinthite, oneillite and voronkovite. The specific feature of raslakite is, among others, the presence of sodium a
Wikidata facts
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- Raslakite.jpg
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- Nickel-Strunz 9th edition (updated 2009)
- 9.CO.10
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.CO.10
- crystal system
- trigonal crystal system
- streak color
- white
- Commons category
- Raslakite
- IMA Mineral Symbol
- Rsk
- chemical formula
- Na₁₅Ca₃Fe²⁺₃(Na,Zr)₃Zr₃(Si,Nb)[(Si₃O₉)₂(Si₉O₂₇)₂SiO](OH,H₂O)₃(Cl,OH)
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Encyclopedic overview
4 sectionsContents
- Occurrence and association
- Notes on chemistry
- Notes on crystal structure
- References
Raslakite is a rare mineral of the eudialyte group with the chemical formula . This formula is based on the original one, and is extended to show the presence of cyclic silicate groups. The additional silicon and oxygen shown in separation from the cyclic groups (in parentheses) are in fact connected with two 9-fold rings. The mineral has lowered symmetry (space group R3, instead of more specific for the group R3m one), similarly to some other eudialyte-group members: aqualite, labyrinthite, oneillite and voronkovite. The specific feature of raslakite is, among others, the presence of sodium and zirconium at the M2 site. Raslakite was named after Raslak Cirques located nearby the type locality.
==Occurrence and association== Raslakite was discovered, together with ikranite, in peralkaline pegmatites of the Mt. Karnasurt, Lovozero massif, Kola Peninsula, Russia. Raslakite is associated with aegirine, fluorcaphite, kazakovite, lamprophyllite, microcline, nepheline, and terskite.
Excerpted from Wikipedia’s “raslakite” article, available under the CC BY-SA 4.0 licence.