Thursday, October 18, 2012

Gemstone of the Week: Emmonsite

(Emmonsite image found on mindat.org)

Emmonsite is a very unusual looking gemstone, with all of its spindly, lichen-like crystals.  It was discovered in 1885 and is named for geologist Samuel Franklin Emmons.  Emmonsite is a hardness 5 and has a vitreous luster.  The crystals tend to be transparent to translucent and is yellowish-green colour. It is a secondary minerals that forms by the oxidation of Tellurium bearing minerals. Emmonsite is found in: Japan, Honduras, Mexico, and the states of Nevada, South Dakota and Arizona.

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