Tags: Chemical Substance, Mineral.
Barbertonite is a magnesium chromium carbonate mineral with formula of [Mg6Cr2(OH)16CO3·4H2O]. It is a hexagonal polymorph of the mineral stichtite and along with stichtite is an alteration product of chromite in serpentinite. Barbertonite has a close association with stichtite chromite and antigorite (Taylor et al. 1973). A study published in 2011 presented evidence that barbertonite is a polytype of stichite and should be discredited as a mineral species.