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heulandite

A monoclinic mineral, (Na, Ca)2-3Al3(Al, Si)2Si13O36.12H2O) ; zeolite group, with extensive substitution of NaSi for CaAl and K predominant over Na; forms in cavities in basalt and andesite, as skarn druses, as diagenetic product in silicic vitreous tuffs, in bentonitic clays, and as authigenic mineral in limestone or sandstone.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 points
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