Heulandite Subgroup : (Na/Ca/K)5-6[Al8-9 Si27-28 O72]· nH2O
Laumontite : CaAl2Si4O12·4H2O
Stilbite Subgroup : M6-7[Al8-9Si27-28O72]·nH2O
Photo added to mindat.org
“heulandite crystal overgrown by laumontite with stilbite (lower right), image width about 8 mm”
Dennis Harries - 8th November 2004
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