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Minerals dehydrate under ambient condition

These minerals must be kept under highly humid circumstance by, for example, sealing in a container with wet cotton. Water insoluble minerals may be kept in water.

• Autunite => Meta-autunite

• Bieberite => Moorhouseite
• Boothite => Chalcanthite => Powder
• Borax => Tincalconite
• Boyleite => Gunningite (slowly under dry condition)
• Buserite => Birnessite

• Carnotite (Amount of zeolitic water changes under dry condition.)
• Chalcanthite => Powder
• Chalcophyllite (Amount of bound water changes depending on humidity.)
• Coquimbite => White powder (under dry condition)

• Epsomite => Powder (under dry condition)

• Falottaite => Lindbergite
• Ferrarisite => Ca₅(AsO₄)₂(HAsO₄)₂,2.5H₂O (under dry condition)

• Gaylussite => Powder (alters to Calcite by water)

• Hydrohonessite => Honessite (depending on tempeature and/or humidity)
• Hydrotungstite => Tungstite (Almost all stocked specimens)
• Hydrowoodwardite => Woodwardite (under dry condition, Reversible)

• Ianthinite => Schoepite
• Ikaite => Calcite (Unstable above 8 degree)
• Ilesite => White => Szmikite
• Inyoite => Surface turns white.

• Jôkokuite (Jokokuite) => Ilesite (in a month) => White => Szmikite

• Kernite => Tincalconite

• Lansfordite => Nesquehonite
• Laumontite => White powder

• Malachite => Tenorite (above 315 degree)
• Mallardite => Jôkokuite (Jokokuite) => Ilesite (in a month) => White => Szmikite
• Melanterite => Siderotil
• Melanterite => Rozenite (below 21 degree under dry condition)
• Mendozite => Tamarugite
• Metaschoepite => Paulscherrerite
• Minohlite => Schulenbergite (above 50 degree)
• Mirabilite => Thénardite (under dry condition)
• Montmorillonite => Spacings parallel to the basal plane changes.
• Morenosite => Retgersite

• Natron => Thermonatrite

• Osakaite => Namuwite (under dry condition, Reversible)

• Paranatrolite => Natrolite (Reversible)
• Pharmacolite => Haidingerite (at 60 degree)
• Phaunouxite => Rauenthalite

• Schoepite => Metaschoepite => Paulscherrerite
• Schoepite => Paraschoepite
• Sideronatrite => Metasideronatrite (Reversible, by exposure to sunlight under low humidity)
• Switzerite => Metaswitzerite (in the air)

• Torbernite => Metatorbernite
• Tyuyamunite => Metatyuyamunite (under dry condition by dehydration of zeolitic water)

• Uranocircite => Metauranocircite
• Uranopilite => Meta-uranopilite

• Weddellite => Whewellite (in the air)

• Zeunerite => Metazeunerite
• Zincmelanterite => Boyleite => Gunningite (slowly under dry condition)