sulfuric deposits on the stones, volcano teide, tenerife island, canary islands

brimstone caldera canyon clinker crater delf delft deposit depths desert earth earthdeposit emission extinct geognosy geological geology geothermal ground igneous impregnation inclusion island lava magma mine mineral mountain natural ore pit poisonous quarry resourses rock soil stones stratovolcano sulfur sulfuric sulphur surface teide tenerife terrain toxic volcanic volcano vulcan vulcanian