Data di Pubblicazione:
2009
Citazione:
Demantoid from Val Malenco, Italy: Review and Update / I. Adamo, R. Bocchio, V. Diella, A. Pavese, P. Vignola, L. Prosperi, V. Palanza. - In: GEMS & GEMOLOGY. - ISSN 0016-626X. - 45:4(2009), pp. 280-287.
Abstract:
New data are presented for demantoid from
Val Malenco, Italy, as obtained by classical
gemological methods, electron microprobe and
LA-ICP-MS chemical analyses, and UV-Vis-NIR
and mid-IR spectroscopy. The results confirmed
that these garnets are almost pure andradite
(≥98 mol%, RI >1.81, SG = 3.81–3.88). All 18
samples studied contained “horsetail” inclusions,
which are characteristic of a serpentinite
geologic origin. Fe and Cr control the coloration
of demantoid, though color variations in these
samples were mainly correlated to Cr content.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
I. Adamo, R. Bocchio, V. Diella, A. Pavese, P. Vignola, L. Prosperi, V. Palanza
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