Chemistry:Johannsenite
| Johannsenite[1] | |
|---|---|
 | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | CaMn2+Si 2O 6 |
| Crystal system | Monoclinic |
| Identification | |
| Color | blue-green, grey-white, dark brown, colourless |
| Mohs scale hardness | 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 ,[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
- ↑ "Johannsenite". https://www.mindat.org/min-2103.html.
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
- ↑ 3.0 3.1 "Johannsenite | mineral" (in en). https://www.britannica.com/science/johannsenite.
- ↑ Mao, Jingwen; Bierlein, Frank P. (2008-01-08) (in en). Mineral Deposit Research: Meeting the Global Challenge: Proceedings of the Eighth Biennial SGA Meeting, Beijing, China, 18 - 21 August 2005. Springer Science & Business Media. pp. 507. ISBN 978-3-540-27946-4. https://books.google.com/books?id=AvTAU8ay-F8C&q=Johannsenite+occurrence&pg=PA507.
- ↑ 5.0 5.1 5.2 Sorrell, Charles A. (2001-04-14) (in en). Rocks and Minerals: A Guide to Field Identification. Macmillan. pp. 178. ISBN 978-1-58238-124-4. https://books.google.com/books?id=mQd7AgAAQBAJ&q=johannsenite&pg=PA178.
- ↑ (in en) Geological Survey Professional Paper. U.S. Government Printing Office. 1964. pp. 123. https://books.google.com/books?id=Ph0lAQAAIAAJ&q=Johannsenite&pg=RA4-PA123.
- ↑ Skinner, H. Catherine W.; Skinner, Lecturer in Surgery and Associate Professor of Biochemistry H. Catherine W.; Ross, Malcolm; Frondel, Clifford (1988) (in en). Asbestos and Other Fibrous Materials: Mineralogy, Crystal Chemistry, and Health Effects. Oxford University Press. pp. 50. ISBN 978-0-19-503967-2. https://books.google.com/books?id=gGfmCwAAQBAJ&q=Johannsenite+occurrence&pg=PA50.
- ↑ Deer, William Alexander; Howie, Robert Andrew; Zussman, J. (1997) (in en). Rock-Forming Minerals: Single-chain Silicates, Volume 2A. Geological Society of London. pp. 417. ISBN 978-1-897799-85-7. https://books.google.com/books?id=x0_kPGjeYcMC&q=Johannsenite+occurrence&pg=PA417.
- ↑ "Johannsenite". https://www.mindat.org/min-2103.html.
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