Be careful when using crystals in your water! Be smart! Be safe.
Here is the list of the poisons found in the stones with a brief description of why it is dangerous:
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asbestos – inhaling fibers can cause mesothelioma and lung cancers
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arsenic – a poison that affects the heart and lungs
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aluminum – affects the brain and is linked to Alzheimer’s
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barium – chemical element that affects nervous system, immune system, eyes and heart; radioactive
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copper – overexposure affects liver, gastrointestinal and cardiovascular systems
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lead – heavy metal poison affects heart, bones, gastrointestinal and reproductive systems
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magnetic – may interfere with pacemakers
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mercury – heavy metal poison that affects the blood, brain, kidneys and lungs; birth defects
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strontium – chemical element that can hold radiation
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sulphur – a chemical element, overexposure can harm eyes, lungs or other tissues
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vanadium – chemical element that is extremely toxic to lungs, corrosive
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zinc – a chemical element, overexposure is corrosive and poisonous
Here is the alphabetical list of the crystals, rocks, and gemstones with a brief description of why it is dangerous: These should NEVER be used in elixirs or baths!
Actinolite - May contain asbestos.
Adamite - Contains arsenic and some copper
Ajoite - Contains aluminum and copper
Alexandrite - Contains aluminum
Amazonite – Contains copper
Atacamite - Contains copper
Aquamarine - Contains aluminum
Auricalcite - Contains zinc and copper
Azurite - Contains copper
Beryl - Contains aluminum
Black Tourmaline - Contains aluminum
Boji-stones (aka Concretin, Moqui Balls, Shaman Stone) - Contains sulphur, pyrite and/or marcasite
Bronchantite - Contains copper
Cavansite - Contains copper
Celestite - Contains strontium
Chalcantite - Contains copper
Chalcopyrite (peacock stone) - Contains copper and sulphur
Chrysocolla - Contains copper
Cinnabar - Contains mercury. Handle with gloves as mercury can cross the skin into the body
Conicalcite - Contains copper
Copper = Poisonous
Covellite - Contains copper and sulphur
Crocidolite, also known as blue asbestos, is considered by many to be the world’s most dangerous mineral. The exposure of this fibrous mineral causes fatal diseases including lung and mesothelial cancer.
Cuprite - Contains copper
Dioptase - Contains copper
Dumortierite - Contains aluminum
Emerald - Contains aluminum
Fluorite - Contains fluorine
Garnet (Spessartine, Almandine, Uvarovite, Rhodolite,Hessonite) - Contains aluminum
Gem Silica - Contains copper
Galena – Contains lead
Garnierite (aka Falcondoite) - Contains nickel
Hematite - Will rust, magnetic may interfere with pacemakers
Iolite - Contains aluminum
Kunzite - Contains aluminum
Labradorite - Contains aluminum
Lapis Lazuli - Contains pyrite
Lepidolite - Contains aluminum
Magnetite - Will rust, magnetic so do not use if pacemaker
Malachite - Contains copper
Markasite - Contains sulphur
Mohawkite - Contains copper and Arsenic
Moldavite - Contains aluminum oxide
Moonstone - Contains aluminum
Morganite - Contains aluminum
Orpiment – Contains arsenic, poisonous
Pietersite - Fibrous form contains asbestos
Prehnite - Contains aluminum
Psiomelan - Contains barium
Pyrite - Contains sulphur
Realgar - Contains sulphur and arsenic
Ruby - Contains aluminum
Sapphire - Contains aluminum
Selenite - Although not toxic, friable; tiny shards may break off in water
Serpentine - Fibrous form contains asbestos
Shungite – Magnetic, can interfere with pacemakers
Smithsonite - May contain copper
Sodalite - Contains aluminum
Spinel - Contains aluminum
Spodumene (aka Kunzite) - Contains aluminum
Staurolite - Contains aluminum
Stibnite - Contains lead and antimony
Stilbite - Contains aluminum
Sugilite - Contains aluminum
Sulfur = Poisonous as an acid
Sunstone - Contains aluminum
Tanzanite–Gem variety of Zoisite. - Contains aluminum
Tiger Eye - Fibrous form contains asbestos
Topaz - Contains aluminum
Torbenite = Radioactive
Tourmaline - Contains aluminum
Tremolite - May contain asbestos
Turquoise - Contains copper and aluminum
Vanadinite - Contains vanadium
Variscite - Contains aluminum
Vesuvianite - Contains aluminum
Wavellite - Contains aluminum
Wulfenite - Contains lead and molybdenum
Zircon - Contains zirconium, radioactive
Zoisite - Contains aluminum
Here is some more information on Gemstone Toxicity - Gemstone Toxicity Table - International Gem Society - IGS
The comprehensive list can be found here