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I was wondering about the safety of a specific mineral, Selenite. From my research, I have read that selenite is the crystalline form of gypsum, which is hydrous calcium sulfate. I was wondering if I were to grind selenite and mix about a 1/2 tsp with 3 ounces of water and spray around my home, is that dangerous? Also will the grinding process be dangerous if any small amounts of dust are inhaled?

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Gypsum is the major constituent of plaster. It is non-toxic.

Our lungs are capable of filtering out particles greater than 50 micrometers in diameter. Any dust finer than that is potentially dangerous.

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