Pyroxmangite

Big Photo

Brazil
4.36 carats
© Palagems

Pyroxmangite is misnamed as being a manganese member of the pyroxene group; it is a pyroxenoid.

Pyroxmangite forms translucent red, red-brown, dark-brown, pink, brownish, yellowish, purplish tabular crystals with vitreous to pearly lustre. Crystals are frequently twinned.

Fine crystals have been faceted, but it is usually more suitable for cabochons.

Pyroxmangite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 

Pyroxmangite Gemstones by Size

This table shows distribution of Pyroxmangite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.27 cts
Heaviest:35.22 cts
Average:7.30 cts
Total photos:9
Do you have a larger Pyroxmangite? Why not upload a photo?
0.27ct to 3.77ct3.77ct to 7.26ct7.26ct to 10.76ct10.76ct to 14.25ct14.25ct to 17.75ct17.75ct to 21.24ct21.24ct to 24.74ct24.74ct to 28.23ct28.23ct to 31.73ct31.73ct to 35.22ct
General Information
Chemical Formula
(Fe,Mn)
 
7
Si
 
7
O
 
21
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Pyroxmangite
Mohs Hardness5 to 6
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity3.76 to 3.77
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Cleavage QualityPerfect
Michael O’Donoghue, Gems, Sixth Edition (2006)
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FractureUneven
Arthur Thomas, Gemstones (2009)
Optical Properties of Pyroxmangite
Refractive Index1.735 to 1.756
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterBiaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.017 to 0.019
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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DispersionModerate
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Red, pink, brownish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous,Pearly
Arthur Thomas, Gemstones (2009)
Crystallography of Pyroxmangite
Crystal SystemTriclinic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitTabular
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Pyroxmangite occurs in regionally metamorphosed manganese ore deposits and in manganiferous rocks.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Further Information
Mineral information:Pyroxmangite information at mindat.org
Significant Gem Localities
Australia
 
  • New South Wales
    • Yancowinna Co.
      • Broken Hill district
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 442
Japan
 
  • Honshu Island
    • Chubu Region
      • Aichi Prefecture
        • Kita-Shidara-gun
          • Shidara-cho
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 442
Peru
 
  • Huánuco Department
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