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See also:POLLUX, or POLLUCITE , a rare See also:mineral, consisting of hydrous See also:caesium and See also:aluminium silicate, HZCs4A14(SiO3)9 . Caesium See also:oxide (CssO) is See also:present to the extent of 30-36 %, the amount varying somewhat owing to partial replacement by other alkalis, chiefly See also:sodium . The mineral crystallizes in the cubic See also: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 " See also:castor " (see See also:PETALITE), in cavities in the See also:granite of the See also:island of See also:Elba, and with See also:beryl in See also:pegmatite See also:veins at See also:Rumford and See also:Hebron in See also:Maine . |
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