Pyroxmangite

Pyroxmangite
Pyroxmangite from Chubu Region, Honshu Island, Japan
General
Category	Inosilicate minerals (single chain)
Group	Pyroxene group
Series	Pyroxferroite-Pyroxmangite series
Formula	MnSiO3
IMA symbol	Pxm[1]
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	5+1⁄2 – 6
Luster	vitreous, pearly
Streak	colorless
Diaphaneity	transparent, translucent
Specific gravity	3.8
Birefringence	δ=0.018
Other characteristics	morphology: tabular crystals, granular massive, grainy
References	[2][3][4]

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

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]

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.

Media related to Pyroxmangite at Wikimedia Commons

This article about a specific silicate mineral is a stub. You can help Wikipedia by adding missing information.

• v
• t
• e