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.
The metasomatic alteration resulted in a network of veins where the sedimentary rocks are transformed into a very fine-grained white to pale green skarn rock, locally rich in cavities containing crystals of demantoid garnet.
In a few cases, recognizable fossil shells, corals and even ammonites have been replaced by garnet and quartz, and form the matrix for demantoid crystals.
Besides, we wanted to visit the demantoid mines themselves.
Truly first-class demantoid finds are rare, but they are the "paydays" after months of hard work under extreme conditions.
Matrix specimens showing sharp, lustrous demantoid crystals of lovely emerald-green color (in sunlight) up to 2.
A few of the demantoid specimens are associated with small, dark, acicular crystals, probably of vesuvianite.
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.
Having heard of a place where bowl-shaped specimens solely made up of transparent demantoid crystals occurred, we began to make our plans.
As we made the final 2,000-foot climb to the demantoid locale we passed through small fields of opium poppies tended by Don Justino's children.
5 cm, on calcite from Hunzar, Pakistan, and a selection of excellent single green demantoid (chromian andradite) garnets from Iran.
In the same range the Namgar mine has yielded some good crystals of demantoid garnet.