WGNHS
Wisconsin Geological and Natural History Survey

Amblygonite

Blocky white amblygonite with quartz, in outcrop near Fern, Wisconsin. (Photo by S. Koehler.)

Formula: (Li,Na)Al(PO4)(F,OH) Triclinic

Description:

Amblygonite montebrasite pegmatite. From near Fern, Florence County, Wisconsin. (Photo by Al Falster.)

Amblygonite is generally found as massive white cleavable masses in complex granite pegmatites.

FLORENCE COUNTY: Amblygonite masses up to 5 cm. across occur in zoned pegmatites in sec. 22 T.39N. R.17E., near Fern. (Koehler, 1989).