The substance is chromic oxide, Cr2O3, and contains 68.62 per cent.
Analysis of samples showed an average of 34% of chromic oxide.
Jade is a double silicate of magnesium and aluminum, coloured with chromic oxide.
Ten samples of ore from the deposits near Camaguey contain from 27% to 36% of chromic oxide.
The maximum content of chromium in pure chromite is 46.66% and the content of chromic oxide is 68%.
Much of the material mined as ore does not contain more than 40 to 50% of chromic oxide.