Pyroxmangite

Pyroxmangite, El Molar (Tarragona)

Composition SiO3 (Fe, Mn) Manganese silicate. Crystal system Triclinic
Hardness (Moh´s)
 51/2 -6 Density 3,61- 3,80
Refractive index 1,734- 1,756 Birefringence 0,016- 0,020
Pleocroisme
 medium: red pink/red yellow/red Fluorescence -
Fracture
 uneven I. Dispertion -
Cleavage
 perfect Streak white
Absortion: 548, 503, 455

  • The name it´s because the similitude with the pyroxenes. It´s found in crystals and aggregates granulars. The crystals are tabulars or prismatics.
  • Red, pink in differents tones, brown pinky, sometimes dark due alterations. It has a vitreus brightness, nacred. Transparent to opaque, sometimes but not usually, transparent.
  • Confusions: Rhodonite, Bustamite.
  • Treatments: Unknown.
  • Localities: España (Spain) has massive pyroxmangita, good quality in El Molar (Tarragona).
  • Gemologicals uses: The transparent Pyroxmangite it´s scarce, if it founds it use to be faceted for a collectors. The massive in cab and carving.

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© Montse Bagué and Josep M. Serrano.Text and photos. Reproduction not allowed without permission.