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Heulandite occurs in basalt cavities. Heulandite (the pink crystals in the image) is found with stilbite (the white tabular crystals) and other zeolites. "Zeolite" literally translates to "boil stone" because rapidly heating a zeolite with a film of water on it will give off a large amount of steam.
It measures 210x150x65mm. The iron stand is not included.