strontianite

{{Infobox mineral | name = Strontianite | boxwidth = | boxbgcolor = | image = Mineraly.sk - stroncianit.jpg | imagesize = 260px | alt = | caption = Strontianite from Slovakia | category = Carbonate minerals | formula = SrCO3 | IMAsymbol = Str | molweight = 147.63 g/mol | strunz = 5.AB.15 (10 ed) 5/B.04-20 (8 ed) | dana = 14.01.03.03 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pmcn | unit cell = a = 5.1 Å, b = 8.4 Å c = 6.0 Å; Z = 4 | color = Colourless, white, gray, light yellow, green or brown; colourless in transmitted light | habit = Prismatic, acicular, pseudo hexagonal, columnar to fibrous, granular, massive | twinning = Very common, usually contact, rarely penetration, also repeated | cleavage = {110} nearly perfect, {021} poor, {010} traces | fracture = Subconchoidal to uneven | tenacity = Brittle | mohs = | lustre = Vitreous, resinous on breaks, greasy | streak = White | diaphaneity = Transparent to translucent | gravity = 3.74 to 3.78 Transparent versions are heavier than the other ones | density = | polish = | opticalprop = Biaxial (−) | refractive = nα = 1.52, nβ = 1.66, nγ = 1.67 | birefringence = 0.15 | pleochroism = | 2V = Measured: 7°, Calculated: 12° to 8° | dispersion = | extinction = | length fast/slow = | fluorescence = Almost always fluorescent | absorption = | melt = | fusibility = | diagnostic = | solubility = Soluble in dilute HCl | impurities = | alteration = Celestine SrSO4 | other = | prop1 = | prop1text = | references = }}

Strontianite (SrCO3) is an important raw material for the extraction of strontium. It is a rare carbonate mineral and one of only a few strontium minerals. It is a member of the aragonite group.