PSA on some toxic minerals
Cinnabar: Is extremely toxic, if you handle it please make sure to wash your hands afterwards. This mineral should under no circumstance be ingested or inhaled.
Galena: Contains lead which is toxic to ingest or inhale, this mineral specimen can be handled but prolonged exposure to its dust can cause serious health issues.
Chalcanthite: Is a copper sulphate crystal, this mineral can cause copper poisoning if ingested, do not under any circumstance place this mineral in gemstone elixirs. This mineral however can be handled. Chalcanthite can sometimes be lab grown and not the natural variation of the mineral.
Asbestos: Unless you are a qualified professional please do not handle this mineral! Do not inhale it, under no circumstances should you ingest this mineral and even handling this mineral can cause serious health issues. Unbelievably asbestos is still sold as mineral samples, luckily most of the ones you find online are generally fake satin-spar or varieties of garnet.
Malachite: Another copper based mineral, cannot be used in elixirs and must be handled carefully. Fibrous malachite specimens can scratch and disintegrate in water, it is a good idea for this mineral to be bought in its polished form. Malachite is being artificially produced and faked, so beware when purchasing online.
Orpiment: An arsenic sulphide mineral, handled incorrectly and left to oxidise this mineral will cause arsenic poisoning. Repeated exposure and handling is not recommended.