demantoid


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Related to demantoid: andradite

demantoid

[də′man‚toid]
(mineralogy)
A lustrous, green variety of andradite; used as a gem.
References in periodicals archive ?
Sapphires, sphene, apatite, demantoid, corundum, quartz.
It was only in November 2008 that French gem dealer Jacque le Quire brought some rough and cut gemstones to the gemological school of the University of Nantes, where they were identified as the andradite variety demantoid (Mocquet et a., 2009a).
During our most recent expedition to Madagascar in the summer of 2009 we decided to visit, among many other localities of geological interest, the new locality for demantoid: Antetezambato.
Matrix specimens showing sharp, lustrous demantoid crystals of lovely emerald-green color (in sunlight) up to 2.5 cm were collected around 1997 (Figs.
Occasionally, some "old-time" Val Malenco demantoids appear on the scene, these specimens having been passed from dealer to dealer at increasing prices with the recycling of old collections.
The Museum of Milan had some really fine demantoid crystals on matrix from Italy.
Remember, the Soviet Union was s011 in existence, and the only demantoid garnet deposits known at that time were locked up within its borders.
Leonard Himes of Minerals America was selling them and told me that the only association was some fibrous material looking like the mountain leather that demantoid from Italy is usually found in.
Among those that caught my eye were a single demantoid gem crystal from Erongo that would make a super thumbnail, and some unusual parisite crystals from Malawi, in clusters up to 5 x 5 cm, fascinating in their form.
Some of the recent mining activities of the Stone Flower Company include: Polar Urals--Kechpel for jadeite (1993-1994); Ural Mountains--Kakodino mine for demantoid (1995-1998); Caucasus Mountains, Dashkesan mine, Azerbaijan for quartz, epidote, magnetite, calcite, garnet, and amethyst (1996 to present); Caucasus Mountains, Kapuldzhyk, Azerbaijan for rutile (1999 to present); and Pamir Mountains, Kyrgyzstan for ruby, quartz, and demantoid (1999 to present).
In the same range the Namgar mine has yielded some good crystals of demantoid garnet.
Lugi Piasco, a dealer from Milan, had a fine selection of the new Madagascar andradites (demantoids and topazolites) described by Federico Pezzotta in the May-June 2010 issue, and attractive pink and green tourmalines from Paprok.