Pollucite

tectosilicate

pegmatite

Formula: Cs(Si2Al)O6.nH2O
Specific gravity: 2.67 to 3.03
Hardness: 6Æ to 7
Streak: White
Colour: Colourless, white, grey, pink, blue, violet
Solubility: Slightly soluble in hot hydrochloric acid; readily soluble in HF
Environments:

Pegmatites

Pollucite occurs only in rare-element, complex lithium-cesium-bearing granitic pegmatites.

Alteration

quartz pseudomorphs after pollucite have been found. Pollucite also alters to analcime, K-feldspar variety adularia, lepidolite, spodumene and clay.
Common impurities: Fe,Ca,K,Rb

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