| 1. | In turn, thenardite can also absorb water and converts to mirabilite.
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| 2. | Rock salt reserves are and mirabilite reserves are.
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| 3. | It slowly turns to mirabilite in damp air.
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| 4. | Both minerals are less common than mirabilite.
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| 5. | They mined both Mammoth Cave and Salts Cave for gypsum and mirabilite, a salty seasoning.
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| 6. | It occurs associated with halite, polyhalite, anhydrite, gypsum, thenardite, mirabilite, sassolite and blodite.
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| 7. | Some craters may have been affected by fumarolic activity, which has left sodium sulfate minerals such as mirabilite.
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| 8. | In humid conditions, thenardite gradually absorbs water and converts to the mineral mirabilite, Na 2 SO 4 ?0H 2 O.
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| 9. | It is commonly associated with other evaporite minerals such as epsomite, mirabilite, halides, and other sodium-magnesium-sulfates.
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| 10. | Mirabilite is unstable and quickly dehydrates in dry air, the prismatic crystals turning into a white powder, thenardite ( Na 2 SO 4 ).
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