Other minerals coloured by a transition metal

4 Other minerals coloured by a transition metal In addition to many of the gems listed in table 4.1, other examples of minerals that owe their colours to crystal field bands (intra-electronic transitions between 3d orbitals within individual cations) include the following  

Ti3+ fitzroyite (Ti phlogopite), some meteoritic and lunar pyroxenes V3+ goldmanite (garnet), tsavorite (garnet), tanzanite (zoisite) 

Cr3+ uvarovite (garnet), kammererite (chlorite), tawmawite (epidote) Mn3+ piemontite (epidote), thulite (zoisite), viridine (andalusite), blan-fordite (pyroxene), juddite and winchite (amphiboles) 

Mn2+ rhodonite, pyroxmangite and bustamite (pyroxenoids), johannsenite (pyroxene), spessartine (garnet), tirodite (amphibole) 

Fe2+ many green ferromagnesian silicates such as peridot, diopside and actinolite, gillespite, 

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