FeAsS
Arsenopyrite is a common sulphide, occurring in a range of environments, It occurs as steel-grey crystals, sometimes tarnished, or massive or granular. Crystals can be stubby or elongated prisms, and sometimes occur as six-rayed twins known as trillings.
Selected Australian Occurrences:
- As silvery crystals in matrix at Broken Hill, New South Wales. Note that it can easily be confused with löllingite at this location.
- As sharp crystals at Tolwong, New South Wales.
- As masses of crystals at the Biggenden Mine, Queensland.
- As fine crystals associated with actinolite and axinite at Colebrook Hill, Tasmania.
- Common as crystals associated with hydrothermal gold veins in Victoria. Crystals can be found in the quartz as well as in the adjacent sedimentary rocks.
