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Johannsenite

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Johannsenite
General
CategoryMineral
Formula
(repeating unit)		CaMnSi2O6
IMA symbolJhn
Crystal systemMonoclinic
Identification
Colorblue-green, grey-white, dark brown, colourless
Mohs scale hardness6
Streakwhite

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.

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.

References

  1. "Johannsenite".
  2. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  3. ^ "Johannsenite | mineral". Encyclopedia Britannica. Retrieved 2021-09-02.
  4. Mao, Jingwen; Bierlein, Frank P. (2008-01-08). Mineral Deposit Research: Meeting the Global Challenge: Proceedings of the Eighth Biennial SGA Meeting, Beijing, China, 18 - 21 August 2005. Springer Science & Business Media. p. 507. ISBN 978-3-540-27946-4.
  5. ^ Sorrell, Charles A. (2001-04-14). Rocks and Minerals: A Guide to Field Identification. Macmillan. p. 178. ISBN 978-1-58238-124-4.
  6. Geological Survey Professional Paper. U.S. Government Printing Office. 1964. p. 123.
  7. Skinner, H. Catherine W.; Skinner, Lecturer in Surgery and Associate Professor of Biochemistry H. Catherine W.; Ross, Malcolm; Frondel, Clifford (1988). Asbestos and Other Fibrous Materials: Mineralogy, Crystal Chemistry, and Health Effects. Oxford University Press. p. 50. ISBN 978-0-19-503967-2.
  8. Deer, William Alexander; Howie, Robert Andrew; Zussman, J. (1997). Rock-Forming Minerals: Single-chain Silicates, Volume 2A. Geological Society of London. p. 417. ISBN 978-1-897799-85-7.
  9. "Johannsenite". www.mindat.org. Retrieved 2021-09-02.
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