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Chrysoprase - Green variety of chalcedony colored by nickel oxide

Formula: SiO2
Colour: colorless, white, gray, ...
Hardness: 6½ - 7
Name: Mentioned by Agricola (1546) of a stone named for the town of Chalcedon, now called Kadıköy, and is a district within the city of Istanbul, Turkey.
From: Queensland, Australia

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