Silvery single nugget of the extremely rare Ir-Ru arsenide mineral iridarsenite from a locality in Alaska (Fox Gulch, Goodnews Bay, Bethel Borough, Alaska, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Iridarsenite
Iridarsenite is an IMA-recognized mineral species in the sulfide class, with the chemical formula IrAs₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: specific gravity 10.9; Metallic luster.
IMA symbol Ird, IMA status: approved, named in 1973.
Found in nuggets or fragments of natural Os–Ir–Ru alloys.
It is found associated with Irarsite, ruthenarsenite, rutheniridosmine.
The name refers to the IRIDium and ARSENic in the composition.