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زمینشناسی و معدن::
محفظه خلاء مهر و موم شده
Specimens enclosed in hermetically sealed containers will react with the atmosphere within that container only until equilibrium concentrations of water vapour and carbon dioxide have been established.
frequently, however, the most practical means of preservation for specimens subject to volatilization is storage in hermetically sealed containers.
The long-term effect of diurnal temperature fluctuations on hermetically sealed containers will depend on whether the compensatory reaction of the specimen occurs within previously reacted areas or at the interface of reacted material and original crystal.
"Hie construction of large hermetically sealed containers is possible,22 but may prove too expensive for all but the most important mineral specimens.
If a hermetically sealed container cannot be provided, then the third manner of preservation - storage within the mineral stability limits - can be employed.
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