Tags: Chemical Substance, Mineral.
Whewellite is a mineral hydrated calcium oxalate formula CaC2O4·H2O. Because of its organic content it is thought to have an indirect biological origin and this is supported by it being found in coal and sedimentary nodules. However it has also been found in hydrothermal deposits where a biological source appears improbable. For this reason it can be classed as true mineral.Whewellite or at least crystalline calcium oxalate does also arise from biological sources.
