AM_Girvasite
Formula: Na Ca2 Mg3 P3 C O21 H12
Name: Girvasite
Unit cell: 6.522 12.25 21.56 90.0 89.48 90.0 , V=1722.45
Space group: P121/C1 (14)

Sokolova E V , Yegorov-Tismenko Y K , Doklady Akademii Nauk SSSR , 331 (1990) p.1372-1376, Crystal structure of girvasite