milarite

milarite

[′mē‚lä‚rīt]
(mineralogy)
K2Ca4Be4 Al2Si24O62·H2O A colorless to greenish, glassy, hexagonal mineral composed of a hydrous silicate of potassium, calcium, beryllium, and aluminum, occurring in crystals.
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In 1950-1952, construction of the Oberaar Power Station (Kraftwerke Oberaar) led to the discovery of several clefts yielding superb specimens of octahedral pink fluorite associated with quartz gwindels, adularian orthoclase crystals, and small but fine crystals of milarite and apatite-(CaF).
Other minerals present containing the element include bavenite, beryl, genthelvite, milarite, and helbertrandite.
Fundortgruppe 3 is very similar, but orthoclase ("adularia"), actinolite (fibrous "amianthus"), apophyllite and zeolites are more common than in 4; milarite is found, very rarely, in 3 alone.
The rare beryllium silicate milarite has been found as crystals to 0.
Centered on a quartz crystal cluster 2 meters tall, this alcove featured a series of cases of specimens from the Alpine clefts of the Rauristal (Austria) and Ahrntal (Italy), including three astonishing milarite specimens (one of them was pictured in "Alpine Milarite," Sept.
There are numerous world localities, but most of the best milarite specimens come from clefts in alkaline igneous rocks in the Alps, and are collected by mountaineering Strahlers.
Other associated minerals are: scandiobabingtonite, scandian ixiolite, hingganite-(Y), cerian epidote, titanite, plumbomicrolite and other microlite minerals, bazzite, milarite cassiterite and two unidentified tantalum minerals (rynersonite?
The American Museum of Natural History dipped into their Bement Collection again and brought out Alpine species rarely seen, including milarite, scheelite, lengenbachite and extremely fine anatase to name just a few.
Associated minerals are: muscovite, quartz, elbaite, topaz, milarite, calcite, chabazite, stilbite-stellerite, rutile, fluorite, pyrrhotite, sphalerite and pyrite.
Milarite from Austria in single crystals to 1 cm would make fine and rare thumbnail specimens.
1998) Shibkovite--the new mineral from the milarite group.
Carlos Barbosa, though, did have bigger supplies of bigger, better loose prisms of rich yellow-green milarite from Jaguaracu, Minas Gerais, than previously, as well as some small miniatures with pale green glittery rounded aggregates of tiny crystals of the rare zanazzaiite, with muscovite.