Minerals, as raw structural materials or pigments, play a fundamental role in archaeometry,
for the understanding of nature, structure and status of an artefact or object of interest for …

Synthetic and natural spinel single crystals having compositions closely approaching spinel
end‐members ZnCr2O4, MgCr2O4, FeCr2O4, ZnAl2O4, MgAl2O4, CoAl2O4, FeAl2O4 …

Twenty natural spinel single crystals displaying colors almost representative for the entire
spinel variability were investigated by electron microprobe and UV–VIS–NIR–MIR and FTIR …

The oxygen isotopic composition of pink to red and other colored spinels hosted by marbles
worldwide have been combined with trace elements investigated by electron microprobe …

Photoluminescence spectroscopy of Cr 3+ shows considerable potential for probing local
cation arrangement in MgAl 2 O 4 spinel while undergoing order-disorder phase transition …

A red spinel, MgAl 2 O 4, from Burma (Myanmar) containing as chromophores ca. 0.5 wt% of
each Cr 2 O 3 and V 2 O 3, was sequentially heated for at least 72 h at temperatures ranging …

Spinel is a precious stone with a long history. In ancient societies spinel was considered to
be an imitation of ruby. With the depletion of ruby mineral resources, gem—grade spinel has …

Purple-violet gem spinels from Tanzania and Myanmar have been investigated for their
gemological, spectroscopic, chemical, and colorimetric characteristics. Samples TS and MS …

MATERIALS AND METHODS Materials. The Vietnamese spinel (sample VN, figure 5) was
acquired from Geir Atle Gussiås and Mai Tran of Balder Gems. They purchased it from …

Research on photoluminescence spectroscopy on Cr-doped gem materials has
demonstrated great success regarding the identification of gemstones in terms of building …