Johannsenite

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Johannsenite[1]
Johannsenite-233188.jpg
General
CategoryMineral
Formula
(repeating unit)
CaMn2+Si2O6
IMA symbolJhn[2]
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.[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[edit]

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's also found in veins.[5]

References[edit]

  1. ^ "Johannsenite".
  2. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.
  3. ^ a b "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. ^ a b c 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.