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.

[7] The mineral is vulnerable to oxidation, hydration, and carbonation.

[8] The mineral was named in 1932 after Albert Johannsen.

[3] Johannsenite can be found in limestone affected by the element magnesium during metamorphosis.