Gilalite

IMA formula: Cu₅Si₆O₁₇·7H₂O

Crystallography: Likely monoclinic. Space group unknown. a = 13.38 Å, b = 19.16 Å, c = 9.026 Å, β ~ 90°. Z = 4.

Gilalite crystals suitable for SC-XRD haven’t been found, therefore gilalite’s point/space group, exact formula and Z remain unknown. No synthetic analogues are known.