Since 2002, tsavorite and other grossular varieties have been recovered from a primary deposit at Itrafo, a village in the Andrembesoa area of central Madagascar. Twenty-two samples from this locality were investigated by classical gemological methods, chemical analysis, and UV-Vis-NIR and mid-IR spectroscopy. The garnets' chemical composition was nearly pure grossular (>92 mol.%), with iron and vanadium as the main chromophores. Their iron content and Fe<sub>2</sub>O<sub>3</sub>:V<sub>2</ sub>O<sub>3</sub> ratio were higher than those generally found in tsavorite from well-known deposits. Although the Itrafo deposit is relatively large, and new veins could be discovered, future production will be limited by access difficulties and security concerns.
|Titolo:||Tsavorite and other grossulars from Itrafo, Madagascar|
ADAMO, ILARIA (Primo)
|Settore Scientifico Disciplinare:||Settore GEO/06 - Mineralogia|
Settore GEO/09 - Georisorse Miner.Appl.Mineral.-Petrogr.per l'amb.e i Beni Cul
|Data di pubblicazione:||2012|
|Digital Object Identifier (DOI):||10.5741/GEMS.48.3.178|
|Appare nelle tipologie:||01 - Articolo su periodico|