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PHILLIPSITE

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Originally appearing in Volume V21, Page 408 of the 1911 Encyclopedia Britannica.
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PHILLIPSITE , a See also:

mineral of the zeolite See also:group; a hydrated See also:potassium, See also:calcium and See also:aluminium silicate, approximating to (K2, Ca)AI2(SiOa)4.4H2O. It varies somewhat in See also:composition, and a variety (" pseudophillipsite ") containing rather less See also:silica has the See also:formula (K.2, Ca)2Al4Si5018.9H20. Crystals are See also:monoclinic, but only complex cruciform twins are known, these being exactly like twins of See also:harmotome (q.v.). Crystals of phillipsite are, however, usually smaller and more transparent and glassy than those of harmotome. Spherical See also:groups with a. radially fibrous structure and bristled with crystals on the See also:surface are not uncommon. The hardness is 42, and the specific gravity 2.2. The See also:species was established by A. See also:Levy in 1825 and named after See also:William See also:Phillips. See also:French authors use the name christianite (after See also:Christian VIII. of See also:Denmark), given by A. See also:Des Cloizeaux in 1847. Phillipsite is a mineral of secondary origin, and occurs with other See also:zeolites in the amygdaloidal cavities of basic volcanic rocks: e.g. in the See also:basalt of the See also:Giant's See also:Causeway in See also:County See also:Antrim, and near See also:Melbourne in See also:Victoria; and in lencitite near See also:Rome. Small crystals of See also:recent formation have been observed in the See also:masonry of the hot See also:baths at Plombieres and Bourbonneles-Bains, in See also:France.

See also:

Minute spherical aggregates embedded in red See also:clay were dredged by the " Challenger " from the bottom of the Central Pacific, where they had been formed by the decomposition of See also:lava. (L. J.

End of Article: PHILLIPSITE

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