Abstracts; Summer 2009
This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Bohemian Garnet – Today
Red garnets have been mined in the Bohemian Hills of Czechoslovakia since the 16th century.
The Cause of Iridescence in Rainbow Andradite from Nara, Japan
“Rainbow” andradite from Nara, Japan, occurs as relatively small orangey brown crystals that show attractive iridescence in almost the entire range of the spectrum.
Garnets from Altay, China
Gem-quality spessartine garnet and grossular garnet have been discovered in Altay, China.
Pink to Pinkish Orange Malaya Garnets from Bekily, Madagascar
Malaya garnets from Bekily, Madagascar, are predominantly pink to pinkish orange, with some stones orange to red.
Spessartine Garnet from Ramona, San Diego County, California
For most of the 20th century, the principal source of fine spessartine was the area around the Little Three mine near the town of Ramona in southern California.
Gem-Quality Grossular Garnets
The gemmological classification and identification of gem grossular garnets is examined.
Garnets from Madagascar with a Colour Change of Blue-Green to Purple
Gemmological, chemical, spectroscopic and microscopic properties of blue-green colour-change garnets from a new deposit near Bekily, Madagascar, are given.
Gem-Quality Grossular-Andradite: A New Garnet from Mali
A find of new gem garnets has been made in contact metamorphic deposits in the Republic of Mali, western Africa.
Gem Garnets in The Red-To-Violet Colour Range
This article shows that the characteristic of colour appears to have little correlation with variations in bulk (not trace) composition or physical properties.