1) Cubic mineral 2) Iron mineral
Found on
https://www.crosswordclues.com/clue/hercynite
Hercynite is a spinel mineral with the formula FeAl2O4. It occurs in high-grade metamorphosed iron rich argillaceous sediments as well as in mafic and ultramafic igneous rocks. Due to its hardness it also is found in placers. It was first described in 1847 and its name originates from the Latin name for the Harz, Silva Hercynia, where the species ...
Found on
http://en.wikipedia.org/wiki/Hercynite
the mineral iron aluminum oxide, a member of the spinel (q.v.) series.[1 related articles]
Found on
http://www.britannica.com/eb/a-z/h/40
No exact match found.
