amazon stone

amazonite

[am-uh-zuh-nahyt]
noun Mineralogy.
a green feldspar, a variety of microcline, used as an ornamental material.
Also called Amazon stone.


Origin:
1595–1605; Amazon (river) + -ite1

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World English Dictionary
amazonite (ˈæməzəˌnaɪt)
 
n
Also called: Amazon stone a green variety of microcline used as a gemstone. Formula: KAlSi3O8

Collins English Dictionary - Complete & Unabridged 10th Edition
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