[4] Its name is derived from Mutorashanga, a small ferrochrome mining town in Zimbabwe where the mineral was discovered in the 1950s.

[4][9] Chrome chalcedony (unlike chrysoprase) may also contain tiny black specks of chromite.

This is a cryptocrystalline form of silica, consisting of fine intergrowths of the minerals quartz and moganite.

[1] Chrome chalcedony (known as mtorolite, mtorodite or matorolite) occurs in Zimbabwe, principally near to the mining town of Mtoroshanga, located on the Great Dyke geological feature.

The source of the mineral is unclear, as whilst Pliny the Elder described it as coming from India, no deposits have been found there.