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Rossiantonite, ideally Al 3 (PO 4 )(SO 4 ) 2 (OH) 2 (H 2 O) 10 ·4H 2 O, triclinic (space group P1̄), a = 10.3410(5), b = 10.9600(5), c = 11.1446(5) Å, a = 86.985(2), b = 65.727(2), g = 75.064(2)°, V = 1110.5(1) Å 3 , Z = 2, is a new mineral from the Akopan-Dal Cin cave system in the Chimanta massif (Guyana Shield, Venezuela). The mineral occurs as small (≤0.15 mm) and transparent crystals in a white to slightly pink fine-grained sand, filling spaces between boulders of weathered quartz sandstone. Associated phases are gypsum, sanjuanite, rare alunite, quartz and micro-spherules of amorphous silica.

american mineralogist

Rossiantonite, Al 3 (PO 4 )(SO 4 ) 2 (OH) 2 (H 2 O) 10 ·4H 2 O, a new hydrated aluminum phosphatesulfate mineral from Chimanta massif, Venezuela: Description and crystal structure