Johannsenite

Johannsenite is a silicate mineral that is a member of the pyroxene family. The mineral can be produced in limestone or due a metamorphic process. The mineral is also associated with Pb-Zn mineralization.

It is a relatively rare material. but is said to be abundant in the Aravaipa region of Arizona. It is commonly found as a spherulite like aggregate.

The mineral is vulnerable to oxidation, hydration, and carbonation. It is also commonly altered to rhodonite.

The mineral was named in 1932 after Albert Johannsen.