Bystrite is a

silicate mineral Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of minerals and make up approximately 90 percent of Earth's crust. In mineralogy, silica (silicon dioxide, ) is usually consid ...

with the formula (Na,K)₇Ca(Si₆Al₆)O₂₄S_4.5•(H₂O), and a member of the

cancrinite Cancrinite is a complex carbonate and silicate of sodium, calcium and aluminium with the formula Na6 Ca2 O3)2.html" ;"title="carbon">C Coxygen">O3)2">

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mineral group. It is a crystal structure">hexagonal In geometry, a hexagon (from Greek , , meaning "six", and , , meaning "corner, angle") is a six-sided polygon. The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°. Regular hexagon A '' regular hexagon'' has ...

Structure

The structure of bystrite could not be easily found due to the mineral exhibiting a strong pseudotranslation, therefore, mineralogists made a model to find out the internal structure of the bystrite mineral, the idea was based on analyzing the tetrahedral frameworks of cancrinite minerals, and it did yield accurate results in predicting the structure of the mineral. Bolotina et al. (2004)

Geologic occurrence

The most studied sample of the mineral was found in the Malaya Bystraya deposit in Russia. Bystrite occurs in

lazurite Lazurite is a tectosilicate mineral with sulfate, sulfur and chloride with formula . It is a feldspathoid and a member of the sodalite group. Lazurite crystallizes in the isometric system although well‐formed crystals are rare. It is usually ...

deposits, and is usually associated with lazurite, calcite, and

diopside Diopside is a monoclinic pyroxene mineral with composition . It forms complete solid solution series with hedenbergite () and augite, and partial solid solutions with orthopyroxene and pigeonite. It forms variably colored, but typically dull ...

.Kretz, Ralph. (2001) Bystrite (Na, K)7Ca(Si6Al6)O24S1.5.H2O. Mineral Data Publishing, 1.2. The mineral is not very widely spread, either that or it has not been really searched for due to the lack of importance or significance. There is only one bystrite deposit that was mentioned in the literature, and that deposit is found in the Malaya Bystraya

deposit located to the west of

Slyudyanka Slyudyanka ( rus, Слюдянка, p=slʲʉˈdʲankə) is a town and the administrative center of Slyudyansky District of Irkutsk Oblast, Russia, located at the southern tip of Lake Baikal, south of Irkutsk, the administrative center of the ...

, and just south of Lake Baikal in

Russia Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eig ...

Literature survey

The first paper addressing Bystrite was by Sapozhnikov, et al. and was originally written in Russian, but mineral data publishing translated most of the important information to English in 2001.Sapozhnikov, A.N., V.G. Ivanov, L.F. Piskunova, A.A. Kashaev, L.E. Terentieva, and E.A. Pobedimskaya. (1991) Bystrite Ca(Na, K)7(Si6Al6O24)(S3)1.5.H2O - A new cancrinite-like mineral. Zap. Vses. Mineral. Obshch., 120(3), 97-100. Referenced in Kretz, Ralph. (2001) Bystrite (Na, K)7Ca(Si6Al6)O24S1.5.H2O. Mineral Data Publishing, 1.2.

References

{{Reflist Cancrinite group Trigonal minerals Minerals in space group 159