NATROLITE Na2Al2Si3O10.2H2O Orthorhombic

Description: Natrolite is a member of the zeolite family that occurs most frequently in veins and as amygdule fillings in basaltic rocks.

BAYFIELD COUNTY: Thin veins of coarsely fibrous radiating clusters of white natrolite cut amygduloidal basalts in roadcut along Hwy 27 NE SE Sec. 32 T.44N R.9W (WSC field notes).
Natrolite is found in amygdules in basalt in the SE SW Sec. 4 T.44N R.6W; the NW SE Sec. 5 T.44N R.6W and the SE SE Sec. 36 T.45N R.6W near Grandview (LaPoint, 1976).

DOUGLAS COUNTY: Natrolite was tentatively identified in thin veinlets with phillipsite (?) and calcite in gouge cutting basalt along the Douglas Fault exposed along the Amnicon River in Amnicon Falls State Park (SE Sec. 29 T.48N R.12W ) (Ludvigson and Anderson, 1986).
- Thin white natrolite xls. up to 5 mm occur along joint surfaces in gabbro at the Buckley Quarry, SE NW Sec. 32 T.48N R.12W south of Hwy. 2, near Amnicon Falls (Cordua, 1991).

MARATHON COUNTY: Natrolite occurs as an alteration product in rocks of the Stettin pluton, near Wausau. (Falster, et. al., 2000). .

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