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Mineralati

Minerals

Braunite

braunite

Mn²⁺Mn³⁺6(Si8O4)

Braunite Mineral Specimen For Sale

Braunite Mineral Specimen For Sale — via www.dakotamatrix.com · Source

Overview

Braunite is a silicate mineral containing both di- and tri-valent manganese with the chemical formula: Mn2+Mn3+6[O8|SiO4]. Common impurities include iron, calcium, boron, barium, titanium, aluminium, and magnesium. Braunite forms grey/black tetragonal crystals and has a Mohs hardness of 6 – 6.5. It was named after the Wilhelm von Braun (1790–1872) of Gotha, Thuringia, Germany. A calcium iron bearing variant, named braunite II (formula: Ca(Mn3+,Fe3+)14SiO24), was discovered and described in 1967 from Kalahari, Cape Province, South Africa.

Scientific references

  1. Braunite — Wikidata. https://www.wikidata.org/wiki/Q413391 Link
  2. Braunite — Wikipedia. https://en.wikipedia.org/wiki/Braunite Link