Polycrystalline pyrite formation to a core, grown radially.
Cavity and crevice formation e.B. in coal deposits – about 250 million years old.
The more sulfur there is, the greyer the color.
Attention: beautiful gold glossy pyrite suns are usually washed with acids.
Location: Sparta – Illinois – USA
Weight: 185 g Dim.: 11 x 8.5 cm