earthstory:ChrysopraseThe most brightly hued variety of microcrystalline quartz (aka agate, chalcedo
earthstory:ChrysopraseThe most brightly hued variety of microcrystalline quartz (aka agate, chalcedony and flint) is the wonderful apple to grass green one known since ancient times as chrysoprase, from the ancient Greek words for gold and leek. The golden bit comes from the frequent presence of associated metallic sulphide minerals such as pyrite, while the bright green is due to impurities of nickel. Keep reading -- source link
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