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.[3] The mineral is also associated with Pb-Zn mineralization.[4]
Johannsenite[1] | |
---|---|
General | |
Category | Mineral |
Formula (repeating unit) | CaMn2+Si2O6 |
IMA symbol | Jhn[2] |
Crystal system | Monoclinic |
Identification | |
Color | blue-green, grey-white, dark brown, colourless |
Mohs scale hardness | 6 |
Streak | white |
It is a relatively rare material.[5] but is said to be abundant in the Aravaipa region of Arizona.[6] It is commonly found as a spherulite like aggregate.[7]
The mineral is vulnerable to oxidation, hydration, and carbonation. It is also commonly altered to rhodonite.[8]
The mineral was named in 1932 after Albert Johannsen.[9]
It can be found in countries like Mexico, Italy, Australia,[5] the United States, Australia, and Japan.[3]
Johannsenite can be found in limestone affected by the element magnesium during metamorphosis. It is also found in veins.[5]