Prehnite epimorph after Laumontite. The elongate crystals of the mineral Laumontite formed first, to be later overgrown by the mineral Prehnite. The Laumontite then dissolved away, leaving the Prehnite behind as hollow tubes that remained in the shape of the Laumontite. Origin is the Poona area, India. Overall width is 150 mm | |
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Crédit: | Science Photo Library / Wiersma, Dirk |
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