Tags: Chemical Substance, Mineral.

Thomsonite is the name of a series of tecto-silicate minerals of the zeolite group. Prior to 1997 thomsonite was recognized as a mineral species but a reclassification in 1997 by the International Mineralogical Association changed it to a series name with the mineral species being named thomsonite-Ca and thomsonite-Sr. Thomsonite-Ca by far the more common of the two is a hydrous sodium calcium and aluminium silicate NaCa2Al5Si5O20·6H2O.

Thomsonite_in_Basalt_Hydrous_calcium_sodium_aluminum_silicate_Grand_Marais_Cook_Minnesota_1884.jpg

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