Berthierite
Berthierite
– FeSb2S4
Calcite
Talc (1)Diamond (10)
Soft. A fingernail can scratch it.
Did you know?
Berthierite forms steel-gray needles almost identical to stibnite. The old way to tell them apart was fire: roasted, berthierite's hidden iron turns the stone magnetic, while stibnite stays inert.
