Английская Википедия:Hercynite
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
- ↑ 1,0 1,1 Ошибка цитирования Неверный тег
<ref>; для сносокHandbookне указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокWebminне указан текст - ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
