First identified in specimens from a railway tunnel at Bergen Hill in Hudson County, New Jersey, (Ca0.5,Na)0.33(Mg,Fe++)3Si4O10(OH)2•n(H2O), Stevensite is a little-known phyllosilicate in the smectite group. This is an old specimen from Langban - accompanied by an old label calling it "Aphrodite."
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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