Pyroxmangite

Summary

Pyroxmangite has the general chemical formula of MnSiO3.[5] It is the high-pressure, low-temperature dimorph of rhodonite.[2]

Pyroxmangite
Pyroxmangite from Chubu Region, Honshu Island, Japan
General
CategoryInosilicate
Formula
(repeating unit)
MnSiO3
IMA symbolPxm[1]
Strunz classification9.DO.05
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupC1
Unit cella = 9.69 Å, b = 10.5 Å,
c = 17.39 Å; α = 112.17°,
β = 102.85°, γ = 82.93°;
V = 1,596.00 Å3; Z = 28
Identification
Colorpink, red, brown
TwinningLamellar on {010}, simple on {001}
CleavagePerfect on {110}, {110}, (110) ^ (110) = 92° poor on {010}, {001}
Fracturehackly, uneven
Tenacitybrittle
Mohs scale hardness5+12 – 6
Lustervitreous, pearly
Streakcolorless
Diaphaneitytransparent, translucent
Specific gravity3.8
Birefringenceδ=0.018
Other characteristicsmorphology: tabular crystals, granular massive, grainy
References[2][3][4]

It was first described in 1913 and named for the mineral group, pyroxenes, and is known as the manganese member.[6] It forms a series with pyroxferroite.

Pyroxmangite occurs in metamorphosed ore deposits rich in manganese. Associated minerals include spessartine, tephroite, alleghanyite, hausmannite, pyrophanite, alabandite, rhodonite and rhodochrosite.[4]

References edit

  1. ^ 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.
  2. ^ a b Ralph, Jolyon, and Ida Chao. "Pyroxmangite: Pyroxmangite Mineral Information and Data." MinDat.org
  3. ^ Barthelmy, David. "The Mineral Pyroxmangite." minerals.net
  4. ^ a b Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (1990). "Pyroxmangite". Handbook of Mineralogy (PDF). Vol. II (Silica, Silicates). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209716. Retrieved December 5, 2011.
  5. ^ Pinckney, Linda R, and Charles W Burnham. "High-Temperature crystal structure of pyroxmangite." American Mineralogist 73 (1988): 809–817. GeoScienceWorld. Web. 13 September 2010.
  6. ^ Ford, W.E. & Bradley, W.M. (1913). "Pyroxmangite, a new member of the pyroxene group and its alteration product, skemmatite". American Journal of Science. 36 (212): 169–174. Bibcode:1913AmJS...36..169F. doi:10.2475/ajs.s4-36.212.169.

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