CHEAP AND EASY MINERAL SOLUTION (free with some effort)
Phylitte (metormorphic rock or volcanic rock dust) is primarily composed of quartz, sericite mica, and chlorite. It is easily manufactured locally with some effort - but in truth can be purchased cheaply and easily from UK suppliers.
Sea Water has both 83 identified minerals and highly diverse anaerobic microbial life.
Sea Water is heavy to carry (and possibly not local) - but Pure Sea Salt can be rehydrated quickly - and easily purchased.
Phylitte is used also in the creation of Red Clay Sulphur.
Value what is near and cheap, rather than expensive from afar.