|
|
chromium dravite
Rare member of the Tourmaline group that is the chromium analogue of Dravite. It is sometimes considered a variety of Dravite, but it is recognized as an individual mineral species by the IMA. Its chemical formula is NaMg3(Cr,Fe3+)6(BO3)3Si6O18(OH)4.
|
< Back
|
