Johannsenite Explained

Johannsenite^[1]
Imasymbol:	Jhn^[2]
System:	Monoclinic
Color:	blue-green, grey-white, dark brown, colourless
Mohs:	6
Streak:	white

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]

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]

Occurrence

It can be found in countries like Mexico, Italy, Australia, the United States, Australia, and Japan.

Johannsenite can be found in limestone affected by the element magnesium during metamorphosis. It is also found in veins.

Notes and References

1. Web site: Johannsenite.
2. Warr. L.N.. 2021. IMA–CNMNC approved mineral symbols. Mineralogical Magazine. 85. 3 . 291–320. 10.1180/mgm.2021.43 . 2021MinM...85..291W . 235729616 . free.
3. Web site: Johannsenite mineral. 2021-09-02. Encyclopedia Britannica. en.
4. Book: Mao. Jingwen. Mineral Deposit Research: Meeting the Global Challenge: Proceedings of the Eighth Biennial SGA Meeting, Beijing, China, 18 - 21 August 2005. Bierlein. Frank P.. 2008-01-08. Springer Science & Business Media. 978-3-540-27946-4. 507. en.
5. Book: Sorrell, Charles A.. Rocks and Minerals: A Guide to Field Identification. 2001-04-14. Macmillan. 978-1-58238-124-4. 178. en.
6. Book: Geological Survey Professional Paper. 1964. U.S. Government Printing Office. 123. en.
7. Book: Skinner. H. Catherine W.. Asbestos and Other Fibrous Materials: Mineralogy, Crystal Chemistry, and Health Effects. Skinner. Lecturer in Surgery and Associate Professor of Biochemistry H. Catherine W.. Ross. Malcolm. Frondel. Clifford. 1988. Oxford University Press. 978-0-19-503967-2. 50. en.
8. Book: Deer. William Alexander. Rock-Forming Minerals: Single-chain Silicates, Volume 2A. Howie. Robert Andrew. Zussman. J.. 1997. Geological Society of London. 978-1-897799-85-7. 417. en.
9. Web site: Johannsenite. 2021-09-02. www.mindat.org.