lavenite

lavenite

[′lä·və‚nīt]
(mineralogy)
(Na,Ca)3Zr(Si2O7)(O,OH,F)2 A mineral composed of complex silicate, occurring in prismatic crystals.
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Lavenite (?) (Na,Ca)[.sub.2](Mn,Fe)(Zr,Ti)[Si.sub.2][O.sub.7](O,OH,F)[.sub.2] (RA)
Lavenite has been reported as an accessory constituent of phonolite "near Cripple Creek," as minute, colorless or pale yellow needles either isolated or as groups of loose crystals.
Associated minerals are: nepheline, alkali-feldspar and lavenite.
Associated minerals are: analcime, gonnardite, vinogradovite, phillipsite, lavenite, seidozerite, fluorapatite, aegirine, potassic feldspar, nepheline, ilmenite, lorenzenite and sodalite.
The syenite pegmatites contain calcium catapleiite, titanium-rich lavenite, lorenzenite, cesium-rich astrophyllite, kupletskite, pyrophanite, leucophanite, strontium-apatite, loparite, calcium-rich seidozerite, strontium-rich and zirconium-rich perrierite, brookite, landauite, murataite, polylithionite, brewsterite, chabazite, monazite, ancylite, bertrandite, vlasovite, hambergite.
The sill is also remarkable for the relative abundance of other minerals characteristic of agpaitic rocks such as catapleiite, lavenite, lorenzenite and mangan-neptunite, and for the presence of villiaumite, vuonnemite and many rare-earth-element (REE)-bearing minerals such as ancylite-(Ce), bastnasite-(Ce), cordylite-(Ce), monazite-(Ce) and synchysite(Ce).
A characteristic of the mineral assemblage, which is similar to that in miarolitic cavities, is an abundance of closely associated astrophyllite, lavenite, rinkite and lorenzenite.
Many of the minerals which are common in the rest of the sill, such as aegirine, eudialyte, lavenite, serandite and lorenzenite, are completely absent.
Labuntsovite Lavenite Lemoynite Lorenzenite Magadiite Makatite Mangan-neptunite Microcline Montmorillonite Muscovite Natrolite Nenadkevichite Nepheline Opal Paranatrolite Pectolite Polylithionite Quartz Rinkite Sazhinite-(Ce) Serandite Shkatulkalite Smectite grp.
Kukharenkoite-(Ce) is a late-stage mineral in the paragenetic sequence, associated with microcline, natrolite, eudialyte, mangan-neptunite, aegirine, rinkite, pyrite, zakharovite, yofortierite, lavenite, astrophyllite and calcite.
Lavenite is relatively common in the tiny cavities that typically surround miarolitic cavities and in mineralized seams; it is common in miarolitic cavities.
Microprobe analysis (WDS) of lavenite gave the following result: [Na.sub.2]O 9.89, CaO 10.44, [K.sub.2]O trace, MnO 9.09, FeO 2.12, MgO 0.10, [Y.sub.2][O.sub.3] 0.46, [Ce.sub.2][O.sub.3] 0.38, Zr[O.sub.2] 18.28, Ti[O.sub.2] 6.79, [Nb.sub.2][O.sub.5] 5.03, Si[O.sub.2] 31.45, F 5.79, [H.sub.2]O 2.04 (calculated by stoichiometry) O = F -2.44, total 99.42 weight %, resulting in the empirical formula:]([Na.sub.1.21][Ca.sub.0.33]).sub.[Sigma]1.54][([Mn.sub.0.48][Ca.sub.0.37][Fe.sub.0.11][Y.sub.0.02][Ce.sub.0.01 ][Mg.sub.0.01]).sub.[Sigma]1.00[([Zr.sub.0.56][Ti.sub.0.32][Nb.sub.0.14]).sub.[Sigma]1.02][Si.sub.1.97][O.sub.7][[F.sub .1.15][(OH).sub.0.85]].sub.2.00], based on 9 anions.