Analyses of cyanite often show the presence of a small amount (usually less than I%) of ferric oxide and sometimes traces of copper, and to these constituents the blue or green color of the mineral is doubtless due.
Analyses of cyanite often show the presence of a small amount (usually less than I%) of ferric oxide. Analyses of cyanite often show the presence of sometimes traces of copper. The blue or green color of the mineral is doubtless due. This is to these constituents.