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Faujasite

Faujasite is a mineral group in the zeolite family of silicate minerals. The group consists of faujasite-Na, faujasite-Mg and faujasite-Ca. They all share the same basic formula (Na₂, Ca, Mg)3.5[Al₇Si₁₇O₄₈]·32 by varying the amounts of sodium,... Wikipedia
Crystal system: Cubic
Crystal class: Hexoctahedral (m3m); H–M Symbol (4/m 3 2/m)
Crystal habit: Octahedral or rarely trisoctahedral crystals up to 4 mm in size
Formula (repeating unit): (Na2,Ca,Mg)3.5·32(H2O)
IMA symbol: Fau
Mohs scale hardness: 4.5-5
Unit cell: a = 24.638–24.65 Å, Z = 32