Collapsed chamber with sulphur coated walls from volcanic gases. Sulphur is picked up from the rocks

Collapsed chamber with sulphur coated walls from volcanic gases. Sulphur is picked up from the rocks deep underground by the steam, that was heated by the magma ponding at depths. At the surface, exsolving gases precipitate the sulphur as the gases mix with the atmosphere.

Wai-O-Tapu, New Zealand