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Boulder Opal is a golden-brown to dark brown stone
Feldspars are a group of rock-forming aluminium tectosilicate minerals
Moss Agate is a variety of Chalcedony
the mineral was named for French paleontologist Eugene Durmortier (1803 to 1873)
in 1906 by two children who stumbled over a metal object stuck in the ground
Ametrine 18x28mm Oval - 15-16 Inch Rounds Boulder Opal is a golden-brownAmetrine is quartz that occurs in bands of purple and yellow. As the name suggests, it is a combination of Amethyst and Citrine. The different colored zones in the stone result from different oxidation states of iron, due to exposure to different temperatures during its formation. It is believed that Ametrine was first introduced to Europe by a conquistadors gift from Bolivia to the Spanish Queen.