Pyroxmangite

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

Pyroxmangite
Pyroxmangite-261781.jpg
Pyroxmangite from Chubu Region, Honshu Island, Japan
General
CategoryInosilicate
Formula
(repeating unit)		MnSiO3
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 hardness​5 1⁄2 – 6
Lustervitreous, pearly
Streakcolorless
Diaphaneitytransparent, translucent
Specific gravity3.8
Birefringenceδ=0.018
Other characteristicsmorphology: tabular crystals, granular massive, grainy
References[1][2][3]

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. 


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 Metasyntactic variable, which is released under the 
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