Online Encyclopedia

POLLUX, or POLLUCITE

Online Encyclopedia
Originally appearing in Volume V22, Page 7 of the 1911 Encyclopedia Britannica.
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POLLUX, or POLLUCITE, a rare mineral, consisting of hydrous caesium and aluminium silicate, HZCs4A14(SiO3)9. Caesium oxide (CssO) is present to the extent of 30-36 %, the amount varying somewhat owing to partial replacement by other alkalis, chiefly sodium. The mineral crystallizes in the cubic system. It is colourless and transparent, and has a vitreous lustre. There is no distinct cleavage and the fracture is conchoidal. The hardness is 61 and the specific gravity 2.90. It occurs sparingly, together with the mineral " castor " (see PETALITE), in cavities in the granite of the island of Elba, and with beryl in pegmatite veins at Rumford and Hebron in Maine.
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