Andradite

Dark brown lustrous andradite crystals. South Dakota. Field of view about 1.2 cm across. (Photo by W.S. Cordua.)

Formula: Ca3Fe2(SiO4)3 Isometric

Description:

Andradite is a member of the garnet group found in calcareous metamorphic rocks, especially marbles and skarns.

FOREST COUNTY: Small grains of andradite, usually with chlorite rims occur in outcrops of the McCaslin Quartzite at the Deer Lookout on Tower Hill in T.34N. R.16E. (Olson, 1984).

MARATHON COUNTY: Small grains of clear yellow andradite occur in the miarolitic cavities of a few pegmatites of the Nine Mile pluton. (Falster, et al., 2000).

OCONTO COUNTY: Small grains of andradite, usually with chlorite rims occur in outcrops of the McCaslin Mountain (Olson, 1984).