Staurolite
Blanchard dam, Royalton, Morrison County, Minnesota, USA
View contains several staurolite twins collected from area downstrema from the dam on the Mississippi River near Royalton Minnesota. It also contains one "staurolite" bought to illustrate a mineral fake. The fake has different hardness, specific gravity, and refractive indices from staurolite. The fake staurolite is about 1.0 cm by 1.5 cm. ...
© Bill Cordua