• Hausmannite - Wikipedia

    en.wikipedia.org/wiki/Hausmannite Hausmannite is a complex oxide of manganese containing both di-and tri-valent manganese. The formula can be represented as Mn 2+ Mn 3+ 2 O 4.It belongs to the spinel group and forms tetragonal crystals. Hausmannite is a brown to black metallic mineral with Mohs hardness of 5.5 and a specific gravity of 4.8.. The type locality is Oehrenstock (Öhrenstock), Ilmenau, Thuringian Forest, Thuringia ...
  • Hausmannite: Mineral information, data and localities.

    www.mindat.org/min-1832.html Hausmannite has a tetragonal distorted spinel structure (due to the Jahn-Teller distortion of the Mn 3+-centred polyhedron). When heated above 1473 K, a cubic high-temperature phase appears (Frenzel 1980). Hausmannite generally forms black granular aggregates or, relatively rare, pseudo-octahedral crystals.
  • Hausmannite | mineral | Britannica

    www.britannica.com/science/hausmannite Hausmannite, a manganese oxide mineral (Mn2+Mn3+2O4) that occurs as brownish black crystals or granular masses in high-temperature hydrothermal veins and in contact metamorphic zones. It is found associated with other oxide minerals of manganese and other metals at Ilmenau, Ger.; Långban, Swed.;
  • Hausmannite | Definition of Hausmannite by Merriam-Webster

    www.merriam-webster.com/dictionary/hausmannite Hausmannite definition is - an opaque mineral Mn3O4 consisting of manganese tetroxide found commonly in brownish black tetragonal crystals.
  • Hausmannite - definition of hausmannite by The Free Dictionary

    www.thefreedictionary.com/hausmannite Define hausmannite. hausmannite synonyms, hausmannite pronunciation, hausmannite translation, English dictionary definition of hausmannite. Noun 1. hausmannite - a mineral consisting of manganese tetroxide; a source of manganese atomic number 25, manganese, Mn - a hard brittle grey polyvalent...
  • Hausmannite Mineral Data

    webmineral.com/data/Hausmannite.shtml General Hausmannite Information : Chemical Formula: Mn++Mn+++2O4 : Composition: Molecular Weight = 228.81 gm Manganese 72.03 % Mn 103.50 % Mn 2 O 3: Oxygen 27.97 % O: 100.00 % 103.50 % = TOTAL OXIDE
  • HAUSMANNITE (Manganese Oxide) - Amethyst Galleries

    www.galleries.com/Hausmannite Ergo, hausmannite has a distorted spinel structure that produces a tetragonal symmetry and a basal cleavage not possible in the spinel group of minerals. At much higher temperatures, the structure of hausmannite converts to the isometric spinel structure. Hausmannite is an interesting, and can be (when well-formed) a first-rate mineral specimen.
  • Haussmannize - definition of haussmannize by The Free ...

    www.thefreedictionary.com/haussmannize Define haussmannize. haussmannize synonyms, haussmannize pronunciation, haussmannize translation, English dictionary definition of haussmannize. or vb to rebuild in a similar fashion as Haussmann rebuilt Paris
  • Hausmannite - Crystal Classics Fine Minerals

    www.crystalclassics.co.uk/product/hausmannite A very rich and rare specimen for the location of Hausmannite from the Wyndham Pit, Bigrigg, Cumbria. Lots of cavities in the massive Hausmannite are lined with black lustrous octahedral crystals to 2mm, associated with spots of creamy Dolomite.
  • Tuning the morphological, structural, optical and ...

    www.sciencedirect.com/science/article/pii/S0749603620302433 In this study, we reported a systematic approach to prepare bare and lead doped Mn3O4 films synthesized by the SILAR method. Morphological, structural…