Heulandite-Na Mineral Data

General Heulandite-Na Information
Chemical Formula:	(Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O)
Composition:	Molecular Weight = 2,725.48 gm
	Potassium 0.79 % K 0.95 % K₂O
	Sodium 3.36 % Na 4.53 % Na₂O
	Calcium 2.60 % Ca 3.64 % CaO
	Aluminum 7.76 % Al 14.66 % Al₂O₃
	Silicon 28.85 % Si 61.73 % SiO₂
	Hydrogen 1.61 % H 14.37 % H₂O
	Oxygen 55.03 % O
	______ ______
	100.00 % 99.88 % = TOTAL OXIDE
Empirical Formula:	Na_3.98Ca_1.77K_0.55Al_7.84Si₂₈O₇₂•21.74(H₂O)
Environment:	Low temperature zeolite found in a wide variety of geologic environments: volcanic rocks, metamorphic rocks, pegmatites, tuffs, and deep-sea sediments.
IMA Status:	Approved IMA 1998 (Dana # Added)
Locality:	Challis, Custer County, Idaho, U.S.A. Link to MinDat.org Location Data.
Name Origin:	Named after the English mineral collector, John Henry Heuland (1778-1856), a British mineral collector and dealer. The Na-dominant member of the heulandite series.
Name Pronunciation:	Heulandite-Na + Pronunciation
Synonym:	Beaumontite
	Lamellar zeolite