Charoite

Charoite is a rare hydrous alkali metal formed by metasomatism of alkalic igneous rocks; it is found (so far) only in Siberia. Its formula is  (K,Sr)_15-16(Ca,Na)₃₂[Si₆O₁₁(O,OH)₆]₂[Si₁₂O₁₈(O,OH)₁₂]₂[Si₁₇O₂₅(O,OH)₁₈]₂(OH,F)₄ · ~3H₂O

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