Natroapophyllite

Ca₄FH₁₆NaO₂₈Si₈

Miura YKato TRucklidge J CMatsueda H

American Mineralogist (1981) 66, 410-423

a=8.875Å   b=8.881Å   c=15.79Å

α=90°   β=90°   γ=90°