stichtite

{{Infobox mineral |boxbgcolor=#d177df| name = Stichtite | boxtextcolor = #fff | image = Stichtite- Lizardite.jpg | alt = | caption = Stichtite on serpentine, Dundas, Tasmania | category = Carbonate minerals | formula = Mg6Cr2CO3(OH)16·4H2O | IMAsymbol = Stt | strunz = 5.DA.50 | dana = | system = Trigonal | class = Hexagonal scalenohedral (m) H-M symbol: ( 2/m) | symmetry = Rm | unit cell = a = 6.19, c = 46.47 [Å]; Z = 3 | color = | colour = Lilac to rose-pink | habit = Fibrous to platy aggregates | twinning = | cleavage = Perfect on {0001} | fracture = | tenacity = flexible, not elastic | mohs = 1.5–2 | lustre = Waxy to resinous | streak = Very pale lilac to white | diaphaneity = Transparent | gravity = 2.16 | density = | polish = | opticalprop = Uniaxial (+) | refractive = nω = 1.516 nε = 1.542 | birefringence = δ = 0.026 | pleochroism = Weak; O = dark rose-pink to lilac E = light rose-pink to lilac | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }}

Stichtite is a mineral, a carbonate of chromium and magnesium; formula Mg6Cr2CO3(OH)16·4H2O. Its colour ranges from pink through lilac to a rich purple colour. It is formed as an alteration product of chromite-containing serpentine. It occurs in association with barbertonite (the hexagonal polymorph of Mg6Cr2CO3(OH)16·4H2O), chromite and antigorite.