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April 8, 2026

Blog cover featuring crystals in water with the title "What Crystals Cannot Go in Water?".

What Crystals Cannot Go in Water? The Complete Safe List

Several common crystals should never go in water — including selenite, which dissolves, malachite, which releases toxic compounds, and pyrite, which rusts and can make water acidic. The Mohs hardness scale gives a rough guide (anything below 6 is generally risky), but hardness alone doesn’t tell the whole story. Porosity, mineral composition, and whether a stone

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