Montmorillonite is a silicate mineral from the smectite group. Sample (green) with apophyllite crystals (transparent).

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Photo credit: © José María Barres Manuel / Alamy / Afripics
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Keywords: apophyllite, close-, geology, green, horizontal, mineral, mineralogy, monoclinic, montmorillonita, montmorillonite, phyllosilicate, sample, silicate, smectite