@article{fdi:010062020,
  title = {{N}ew typology and origin of tsavorite based on trace-element chemistry},
  author = {{F}eneyrol, {J}. and {G}iuliani, {G}aston and {O}hnenstetter, {D}. and {R}ondeau, {B}. and {F}ritsch, {E}. and {F}allick, {A}. {E}. and {I}chang'i, {D}. and {O}mito, {E}. and {R}akotondrazafy, {M}. and {R}anatsenho, {M}. and {L}allier, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{N}ew electron-microprobe analyses of 'tsavorites' from the {N}eoproterozoic {M}etamorphic {M}ozambique {B}elt deposits allow the characterization of green grossular according to its trace-element chemistry ({V}, {C}r, {M}n). {F}ive chemical types are defined: type 1, vanadian grossular with {V} > {C}r > {M}n (in atoms per formula unit); type 2, vanadian grossular with {V} > {M}n > {C}r; type 3, {M}n-bearing vanadian grossular with {M}n > {V} > {C}r; type 4, {M}n-bearing chromian grossular with {M}n > {C}r > {V}; and type 5, {C}r- and {M}n-bearing grossular with {C}r > {M}n > {V}. {T}hese types are also characterized by different absorption spectra in the ultraviolet-visible-near infrared. {T}ype 1 tsavorite spectra show a total absorption below 430 nm due to the high vanadium contents. {T}ype 2 tsavorite spectra present the classical absorption bands of {V}. {T}ypes 3 and 4 tsavorite spectra display additional shoulders at 407 and 408 nm due to {M}n2+, whereas spectra of {C}r-bearing types 4 and 5 tsavorite show the two additional bands of {C}r3+ at 697 and 701 nm. {T}he different absorption spectra also indicate {F}e2+-{T}i4+ charge transfer. {W}e measured {OH} equivalent to 0.08 to 0.38 wt% eq. {H}2{O} within the structure. {C}oncentrations of vanadium, chromium and manganese are good chemical "fingerprints" for determining the geographic provenance of economic tsavorite from {K}enya, {T}anzania and {M}adagascar.},
  keywords = {tsavorite ; green grossular ; electron microprobe analysis ; {UV}-{V}is-{NIR} ; absorption spectra ; chemical typology ; {V}/{C}r ratio ; garnet ; geographic origin ; gemmology ; {AFRIQUE} {DE} {L}'{EST} ; {KENYA} ; {TANZANIE} ; {MADAGASCAR}},
  booktitle = {},
  journal = {{E}uropean {J}ournal of {M}ineralogy},
  volume = {26},
  numero = {2},
  pages = {293--308},
  ISSN = {0935-1221},
  year = {2014},
  DOI = {10.1127/0935-1221/2014/0026-2367},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062020},
}