hercynite meaning

noun
  Black spinel, aluminate of iron

Examples

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1. this is a development of a new generation of “ heavy duty ” magnesia brick based on hercynite spinel and special burning technology
2. this product combines excellent micro structural flexibility with very good coat ability because of dead burned magnesia / low chromite / hercynite combination
3. Hercynite is a spinel of regular symmetry and normal cation distribution, but some disorder occurs in its structure.
4. It consists of ferrous ( Fe2 + ) ions and aluminium ions, however some Fe3 + may be located in the structure of hercynite.
5. The reduction step of the hercynite reaction takes place at temperature ~ 200 o C lower than the traditional water splitting cycle ( 1200 o C ).