New Chromium- and Vanadium-Bearing Garnets from Tranoroa, Madagascar
Pyrope-spessartine garnets from Tranoroa, in southern Madagascar, contain appreciable Cr and somewhat lower V contents.
Pyrope-Spessartine Garnets with Unusual Colour Behaviour
Unusual colour-change garnets.
Two Notable Colour-Change Garnets
The gemmological properties and chemical compositions of two unusual colour-change garnets are reviewed.
The Andradites of San Benito County, California
Mines in San Benito County, California, produce andradite in various colours; some are chatoyant.
Pyrope garnets occur in near-colourless to light orange and pink, as well as the familiar red.
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.
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.
Russian Demantoid, Czar of the Garnet Family
Demantoid, green andradite garnet, was discovered in the Central Ural Mountains of Russia in the mid-19th century.
Unstable Radiation-Induced Yellow-Green Colour in Grossular Garnet
Exposure of some colourless to pale-hued African grossulars to either 60Co or 137Cs gamma rays turns them light yellow-green.