tacharanite

{{Infobox mineral | name = Tachanarite | boxwidth = | boxbgcolor = | image = Tacharanite-468354.jpg | imagesize = | alt = Tachanarite | caption = Globular, white tacharanite (diameter 2.5 mm) from Palagonia, Italy | struct image = | struct caption = | struct imagesize = | struct2 image = | struct2 caption = | struct2 imagesize= | SMILES = | Jmol = | category = | formula = | IMAsymbol = Tch | molweight = 2,180.68 g/mol | strunz = 9.HA.75 | dana = 72.3.2.6 | system = Monoclinic | class = | symmetry = A-centered | unit cell = ,, | color = Milky white | habit = Cryptocrystalline | twinning = | cleavage = Perfect {001} | fracture = Conchoidal | tenacity = Tough | toughness = | mohs = 5 | luster = Vitreous, earthy, dull | streak = White | diaphaneity = Translucent | gravity = 2.33 – 2.36 | density = 2.33 – 2.36 g/cm3Calculated: 2.28 g/cm3 | polish = | opticalprop = Biaxial | refractive = nα = 1.518 – 1.525 | birefringence = 0.0120 | pleochroism = | 2V = | dispersion = Relatively strong | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = Decompose | diagnostic = | solubility = | impurities = Fe, Mg, Na, K | alteration = | other = Non radioactive | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = }}

Tacharanite is a calcium aluminium silicate hydrate (C-A-S-H) mineral of general chemical formula with some resemblance to the calcium silicate hydrate (C-S-H) mineral tobermorite. It is often found in mineral assemblage with zeolites and other hydrated calcium silicates.