bystrite

{{Infobox mineral | name = Bystrite | category = Tectosilicate minerals | group = Feldspathoid group, cancrinite group | image = | alt = | caption = | formula = (Na,K)7Ca(Si6Al6)O24S4.5•(H2O) | IMAsymbol=Bys | molweight = | strunz = 9.FB.05 | dana = 76.02.05.02 | system = Trigonal | class = Ditrigonal pyramidal (3m) H-M symbol: (3m) | symmetry = P31c | color = Yellow | colour = | habit = Tabular to irregular grains and inclusions | twinning = | cleavage = {100} Good | fracture = | tenacity = | mohs = 5 | luster = Vitreous | streak = light yellow | diaphaneity = Transparent to translucent | gravity = 2.43 | density = | polish = | opticalprop = Uniaxial (+) | refractive = nω = 1.584 nε = 1.660 | birefringence = δ = 0.076 | pleochroism = Deep yellow to colorless | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence= | absorption = | melt = | fusibility = | diagnostic = | solubility = | other = | alteration = | references = }} Bystrite is a silicate mineral with the formula (Na,K)7Ca(Si6Al6)O24S4.5•(H2O), and a member of the cancrinite mineral group. It is a hexagonal crystal, with a 3m point group. The mineral may have been named after the Malaya Bystraya deposits in Russia, where it was found.

Bystrite is a cancrinite mineral and exhibits similar physical properties, composition and structure as other cancrinites.