Английская Википедия:Hercynite

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Шаблон:Infobox mineral

Hercynite is a spinel mineral with the formula FeAl2O4.

It occurs in high-grade metamorphosed iron-rich argillaceous (clay-containing) sediments as well as in mafic and ultramafic igneous rocks. Due to its hardness it also is found in placers.[1]

It was first described in 1847 and its name originates from the Latin name for the Harz, Silva Hercynia, where the species was first found.[1][2]

Hercynite is a spinel of regular symmetry and normal cation distribution, but some disorder occurs in its structure. It consists of ferrous (Fe2+) ions and aluminium ions (Al3+); however some ferric ions (Fe3+) may be located in the structure of hercynite.[3]

Melting point of this mineral is inbetween Шаблон:Convert.[4]

References

Шаблон:Reflist


Шаблон:Oxide-mineral-stub

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  3. Шаблон:Cite journal
  4. Шаблон:Cite journal