Hercynite
Hercynite is an oxide mineral recognized for its hardness and durability, with notable Chinese occurrences.
About Hercynite
Hercynite is an oxide mineral in the spinel group and has the chemical formula FeAl₂O₄. It crystallizes in the cubic system and ranks among the harder species, with lasting durability.
Identification & care
Hercynite typically forms octahedral crystals, massive, granular. Its color is typically dark green to black and brownish-black. The luster is vitreous, the streak is grayish-green, and specimens range from translucent to opaque. The cleavage is imperfect on {110}. The fracture is conchoidal, which aids identification.
Collector context
Collector notes
For collectors, Hercynite is a benchmark crystalline species. Documented Chinese occurrences are recorded at Dachang ore field, among others.