Heulandite Subgroup : (Na/Ca/K)5-6[Al8-9 Si27-28 O72]· nH2O
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“"Heulandite" - xls 3 mm - Cala Francese Quarries, La Maddalena, Olbia-Tempio Pausania Province, Sardinia, Italy - coll. and photo Antonio Gamboni.”
Antonio Gamboni - 22nd April 2011
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