Johannsenite

Last updated
Johannsenite [1]
Johannsenite-233188.jpg
General
Category Minerals
Formula CaMn2+Si2O6
IMA symbol Jhn [2]
Crystal system Monoclinic
Identification
Colorblue-green, grey-white, dark brown, colourless
Mohs scale hardness6
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, [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]

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. 1 2 "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. 1 2 3 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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