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Natrolite Knife River, St. Louis County, Minnesota, USA 9 X 6 X 3.5 cm A 4.5 cm pocket filled with natrolite or a closely related species. (Author: John Nash)

Natrolite
Knife River, St. Louis County, Minnesota, USA
9 X 6 X 3.5 cm
A 4.5 cm pocket filled with natrolite or a closely related species. (Author: John Nash)