Percentage amounts of caesium may be found in beryl ( ) and avogadrite ( ), up to 15 wt % Cs 2 O in the closely related mineral pezzottaite ( Cs ( Be 2 Li ) Al 2 Si 6 O 18 ), up to 8.4 wt % Cs 2 O in the rare mineral londonite ( ), and less in the more widespread rhodizite.
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