Pyroxmangite

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Pyroxmangite
Pyroxmangite-261781.jpg
Pyroxmangite from Chubu Region, Honshu Island, Japan
General
Category Inosilicate
Formula
(repeating unit)
MnSiO3
Strunz classification 9.DO.05
Crystal system Triclinic
Crystal class Pinacoidal (1)
(same H-M symbol)
Space group C1
Unit cell a = 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
Color pink, red, brown
Twinning Lamellar on {010}, simple on {001}
Cleavage Perfect on {110}, {110}, (110) ^ (110) = 92° poor on {010}, {001}
Fracture hackly, uneven
Tenacity brittle
Mohs scale hardness 5½–6
Luster vitreous, pearly
Streak colorless
Diaphaneity transparent, translucent
Specific gravity 3.8
Birefringence δ=0.018
References [1][2][3]

Pyroxmangite has the general chemical formula of MnSiO3.[4] It is the high-pressure, low-temperature dimorph of rhodonite.[1]

It was first described in 1913 and named for the mineral group, pyroxenes, and is known as the manganese member.[5] 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.[3]

References[edit]

  1. ^ a b Ralph, Jolyon, and Ida Chao. "Pyroxmangite: Pyroxmangite Mineral Information and Data." MinDat.org
  2. ^ Barthelmy, David. "The Mineral Pyroxmangite." minerals.net
  3. ^ a b Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (eds.). "Pyroxmangite". Handbook of Mineralogy (PDF). II (Silica, Silicates). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209716. Retrieved December 5, 2011. 
  4. ^ Pinckney, Linda R, and Charles W Burnham. "High-Temperature crystal structure of pyroxmangite." American Mineralogist 73 (1988): 809–817. GeoScienceWorld. Web. 13 September 2010.
  5. ^ 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: 169–174. doi:10.2475/ajs.s4-36.212.169. 

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