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Minerals decomposed by hydration under ambient conditions

These minerals must be kept under dry condition. Water insoluble minerals may be kept in water.

• Bassanite => Gypsum (under humid condition)

• Carnallite => Sylvite and Bischofite
• Carnallite (Deliquescent)
• Chloromagnesite (Deliquescent)

• Efremovite => Boussingaultite (under ambient condition)
• Ettringite (Deliquescent)

• Glauberite => Alter to Gypsum by dissolving Na₂SO₄ in water.
• Glauberite => Alter to Hydroglauberite
• Godovikovite => Tschermigite (under ambient condition)

• Halite (Deliquescent)
• Hexahydrite => Epsomite

• Kremersite (Deliquescent)

• Lawrencite (Deliquescent)

• Marcasite => Melanterite
• Mascagnite (slightly Deliquescent)
• Metasideronatrite => Sideronatrite (Reversible)
• Mikasaite (Deliquescent)
• Molysite (Deliquescent)

• Namuwite => Osakaite (under humid condition, Reversible)
• Natrolite => Paranatrolite (under high pressure, Reversible)
• Nitratine (Slightly deliquescent)

• Periclase => Brucite
• Pyrite => Melanterite (Some cases)

• Smythite => Limonite (under humid condition)
• Sylvite (Deliquescent)

• Tschermigite (Deliquescent)

• Woodwardite => Hydrowoodwardite (under humid condition, Reversible)