AM_Astrophyllite_4 Formula: Fe6.282 Na.697 (Ti1.538 Nb.462) Si8 (K1.858 Rb.142) O30 F.5 H8 Name: Astrophyllite Unit cell: 5.3627 11.851 11.668 113.04 94.523 103.093 , V=652.94 Space group: P-1 (2)

Piilonen P C , McDonald A M , Lalonde A E , The Canadian Mineralogist , 41 (2003) p.27-54, Insights into astrophyllite-group minerals II: Crystal chemistry, Note: sample US5, Locality: granitic pegmatite at Mount Rosa, Pikes Peak, Colorado, USA