Greenstone cliff above Phoenix, Keweenaw Co., Michigan

13.5 x 8.7 x 7.6 cm

$75 / Reserved

Dark green sprays of Augite are frozen in a pegmatoidal basalt matrix composed largely of Feldspar. There is mention of crystals of up to 5 cm at the location in the Mineralogy of Michigan by Heinrich. It is quite likely this is the specimen referred to since the crystals are that size and Heinrich was, for many years, the curator of the University of Michigan collection.

Condition: Composed of massive material.

Flaws: Essentially massive material.

This mineral is also found in the following galleries: Minerals From Michigan | Inosilicates | Tectosilicates | Minerals Priced Between 50 and 99 Dollars