Lollingite 2.19 ct

Cushion Cut 7.36 x 5.21 x 3.73 mm
y9625

Lollingite or löllingite

is Iron arsenide with formula FeAs2 ,but it may contain nickel, cobalt and sulfur; the hardness is 5-5.5

Often mixed with very similar arsenopyrite ( FeAsS) ,therefore difficult to distinguish ,is only little bit softer.

It comes from

Coleman Township,Cobalt area, Cobalt- Gowganda region, Timiska mining District,Ontario,Canada