faujasite series

{{Infobox mineral | name = Faujasite | category = Tectosilicate minerals | group = Zeolite group | image = Faujasite subgroup-466643.jpg | imagesize = 290px | caption = | formula = | IMAsymbol = Fau | molweight = | strunz = 9.GD.30 | dana = | system = Cubic | class = Hexoctahedral (mm) H–M Symbol (4/m 2/m) | symmetry = Fdm | unit cell = a = 24.638–24.65 Å, Z = 32 | color = Colorless, white | habit = Octahedral or rarely trisoctahedral crystals up to 4 mm in size | twinning = on {111}, contact and penetration twins | cleavage = {111}, perfect | fracture = Uneven to conchoidal | tenacity = Brittle | mohs = 4.5-5 | luster = Vitreous to adamantine | refractive = n = 1.466–1.480 | opticalprop = Isotropic | birefringence = | pleochroism = None | streak = White | gravity = 1.92–1.93 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent | other = | references = }}

Faujasite (FAU-type zeolite) 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 by varying the amounts of sodium, magnesium and calcium. Faujasite occurs as a rare mineral in several locations worldwide.