Olivine Group Visible Spectra (generally 350 - 2000 nm)

Olivine derives its color primarily from Fe2+ content. The basic color is modified by minor amounts of Fe3+, Ti4+, and Ni2+.  It is green (15 K) with lower contents of Fe2+ but becomes brown (6 K) at high iron contents . 

Synthetic olivines with different transition metal ions

Orientation convention relating the cyrstallographic axes to the directions of the optical absorption spectra:  10 Ångstrom axis = alpha;  6 Ångstrom axis = beta;  4.7 Ångstrom axis = gamma.  Spectra at liquid nitrogen temperature (78 K) generally show better resolution of many of the spectroscopic features..

High Pressure phases in the (Mg,Fe)2SiO4 family


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