Fanned crystals of heulandite tinted a gorgeous green from rich inclusions of celadonite (a mica group mineral, a phyllosilicate of potassium and iron in both oxidation states, aluminium and hydroxide). Not only are the heulandites really cool with this green color, but there is a light-colored matrix that adds a pleasing contrast to the specimen. From the collection of Ed David.
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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