analcime

{{Infobox mineral |boxbgcolor=#ae602d| name = Analcime | boxtextcolor = #fff | category = Tectosilicate minerals | group = Zeolite group | image = Analcime - Kahwan Mountain, Semnan, Iran.jpg | imagesize = 280px | caption = Reddish crystals of analcime up to 1.8 cm in size on matrix | formula = NaAlSi2O6 · H2O |IMAsymbol=Anl | strunz = 9.GB.05 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Ibca |molweight=220.15| color = White, colorless, gray, pink, greenish, yellowish | habit = Typically in crystals, usually trapezohedrons, also massive to granular. | twinning = Polysynthetic on [001], [110] | cleavage = Indistinct on {001}, {010}, {100} | fracture = Uneven to subconchoidal | mohs = 5–5.5 | luster = Vitreous | refractive = n = 1.479–1.493 | opticalprop = Isotropic; anomalously biaxial (−) | pleochroism =None |fluorescence=Short UV = Greenish blueish white Long UV = Green, creamy white-yellow| streak = White | gravity = 2.24–2.29 | fusibility = 3.5 |diaphaneity=Transparent to subtransparent to translucent| other = Weakly piezoelectric and pyroelectric; weakly electrostatic when rubbed or heated }}

Analcime (; ) or analcite is a white, gray, or colorless tectosilicate mineral. Analcime consists of hydrated sodium aluminium silicate in cubic crystalline form. Its chemical formula is NaAlSi2O6 · H2O. Minor amounts of potassium and calcium substitute for sodium. A silver-bearing synthetic variety also exists (Ag-analcite).