[Nhcoll-l] about preservation of halite minerals in an antique colleciton

[gönenç göçmengil]

Dear all, thanks a lot for the valuable information,

I'll forward your answers to the person responsible of the mineral
collection, I hope they can fix this issue,

with my best wishes

Gönenç Göçmengil (PhD in geology)
Istanbul Metropolitan Municipality, Projects Departments
Istanbul, Turkey.





Robert Waller <rw at protectheritage.com>, 27 Ağu 2021 Cum, 16:44 tarihinde
şunu yazdı:

> Hi Gönenç,
>
> Halite dissolves spontaneously (deliquesces) at relative humidity of 75%
> or higher. Halite is unusual in that 75% limit holds regardless of
> temperature.
>
> I don’t think escaping fluid inclusions could be responsible, if for no
> other reason, that the fluid would already be saturated with NaCl.
>
> In my experience, the most likely cause is that a higher than normal RH
> was caused by placing a washed but not completely dried specimen or
> material into the case causing a temporary high RH situation. There may be
> other reasons but that is the first scenario that I would seek to eliminate
> as a possibility.
>
> Best,
>
> Rob
>
>
>
>
>
> Robert Waller, PhD, CAPC, FIIC
> President and Senior Risk Analyst
> Protect Heritage Corp.
> 622 Simoneau Way
> Ottawa  ON  K4A 1P4
> email: rw at protectheritage.com
> internet: www.protectheritage.com
> phone: 613-883-2707 (Canada)
> phone: 303-872-9739 (USA)
> http://orcid.org/0000-0002-9500-4113
>
> skype: rrwaller
>
> *and, *Research Associate, Canadian Museum of Nature
> *and,* Adjunct Assistant Professor, Queen’s University
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>
> *From:* Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> * On Behalf Of *gönenç
> göçmengil
> *Sent:* Friday, August 27, 2021 6:17 AM
> *To:* nhcoll-l at mailman.yale.edu
> *Subject:* [Nhcoll-l] about preservation of halite minerals in an antique
> colleciton
>
>
>
> Dear all,
>
>
>
> A couple of years ago, I handled the curation of an old mineral collection
> in Istanbul Turkey. Minerals are exhibited in a semi-closed exhibition area
> on the ground covered with thick glass. 2-3 years later after the
> establishment of the collection (some specimens collected around 1890-the
> 1900s), one of the big halite samples getting started dissolved suddenly.
> There is no indication of interaction with a fluid, the humidity level is
> fixed around 70% and temperature around 20-22 °C, I suspect maybe it
> contains some fluid inclusions and after a while, they dissolved? or NaCl
> character is not suitable for that microclimate conditions? Did anyone
> experience a similar problem before?
>
>
>
> with my best wishes
>
>
>
> Gönenç Göçmengil (PhD in geology)
>
> Istanbul Metropolitan Municipality, Projects Departments
>
> Istanbul, Turkey.
>
>
>
>
>
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