Hercynite

Source: Wikipedia, the free encyclopedia.
Hercynite
Specific gravity
3.95
Optical propertiesIsotropic
Refractive indexn = 1.8
Other characteristicsnon-radioactive
References[2][3][4]

Hercynite is a spinel mineral with the formula FeAl2O4.

It occurs in high-grade

ultramafic igneous rocks. Due to its hardness it also is found in placers.[2]

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.[2][3]

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.[5]

Melting point of this mineral is inbetween 1,692–1,767 °C (3,078–3,213 °F).[6]

References

  1. S2CID 235729616
    .
  2. ^ a b c Handbook of Mineralogy
  3. ^ a b Webmineral
  4. ^ Mindat
  5. doi:10.1515/nuka-2015-0012
    .
  6. S2CID 219429990
    .


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