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<p class="MsoNormal"><span lang="EN-CA">Hi </span>Gönenç,<o:p></o:p></p>
<p class="MsoNormal">Halite dissolves spontaneously (deliquesces) at relative humidity of 75% or higher. Halite is unusual in that 75% limit holds regardless of temperature.<o:p></o:p></p>
<p class="MsoNormal">I don’t think escaping fluid inclusions could be responsible, if for no other reason, that the fluid would already be saturated with NaCl.<o:p></o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal">Best,<o:p></o:p></p>
<p class="MsoNormal">Rob<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:black">Robert Waller, PhD, CAPC, FIIC<br>
President and Senior Risk Analyst<br>
Protect Heritage Corp.<br>
622 Simoneau Way<br>
Ottawa ON K4A 1P4<br>
email: </span><span style="color:black"><a href="mailto:rw@protectheritage.com"><span lang="EN-CA" style="color:#0563C1">rw@protectheritage.com</span></a><br>
</span><span lang="EN-CA" style="color:black">internet: </span><span style="color:black"><a href="http://www.protectheritage.com/"><span lang="EN-CA" style="color:#0563C1">www.protectheritage.com</span></a><br>
</span><span lang="EN-CA" style="color:black">phone: 613-883-2707 (Canada)<br>
phone: 303-872-9739 (USA)<br>
</span><img border="0" width="16" height="16" style="width:.1666in;height:.1666in" id="Picture_x0020_1" src="cid:image001.gif@01D79B28.26D15890"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#494A4C;background:white"><a href="http://orcid.org/0000-0002-9500-4113"><span style="color:#0563C1">http://orcid.org/0000-0002-9500-4113</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:black">skype: rrwaller<o:p></o:p></span></p>
<p class="MsoNormal"><i><span lang="EN-CA" style="color:black">and, </span></i><span lang="EN-CA" style="color:black">Research Associate, Canadian Museum of Nature<br>
<i>and,</i> Adjunct Assistant Professor, Queen’s University<br>
<img border="0" width="85" height="30" style="width:.8842in;height:.3101in" id="Picture_x0020_5" src="cid:image002.jpg@01D79B28.26D15890" alt="iic_fellowship_logo_2019">
</span><img border="0" width="35" height="35" style="width:.3611in;height:.3611in" id="Picture_x0020_9" src="cid:image003.png@01D79B28.26D15890"> <img border="0" width="95" height="34" style="width:.9861in;height:.3564in" id="_x0000_i1030" src="cid:image004.png@01D79B28.26D15890"><br>
<span lang="EN-CA" style="color:black"> </span><a href="http://www.protectheritage.com/"><span lang="EN-CA" style="color:black;text-decoration:none"><img border="0" width="95" height="30" style="width:.9907in;height:.3148in" id="Picture_x0020_2" src="cid:image005.png@01D79B28.26D15890" alt="ProtectHeritage_logo"></span></a><span lang="EN-CA" style="color:black"> <img border="0" width="60" height="45" style="width:.6203in;height:.4722in" id="Picture_x0020_3" src="cid:image006.png@01D79B28.26D15890" alt="QueensLogo_colour">
</span><a href="http://www.nature.ca/"><span lang="EN-CA" style="color:#0563C1;text-decoration:none"><img border="0" width="95" height="24" style="width:.9861in;height:.2546in" id="Picture_x0020_4" src="cid:image007.png@01D79B28.26D15890" alt="cmn_logo"></span></a><span lang="EN-CA" style="color:black"> <br>
<br>
</span><a href="http://www.facebook.com/ProtectHeritageCorp?ref=tn_tnmn"><span style="color:#0563C1;text-decoration:none"><img border="0" width="102" height="28" style="width:1.0648in;height:.287in" id="Picture_x0020_6" src="cid:image008.png@01D79B28.26D15890" alt="image007"></span></a><span lang="EN-CA" style="color:black">
</span><a href="https://twitter.com/#!/ProtectHeritage"><span lang="EN-CA" style="color:black;text-decoration:none"><img border="0" width="76" height="28" style="width:.787in;height:.287in" id="Picture_x0020_7" src="cid:image009.png@01D79B28.26D15890" alt="image009"></span></a><span lang="EN-CA" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu> <b>
On Behalf Of </b>gönenç göçmengil<br>
<b>Sent:</b> Friday, August 27, 2021 6:17 AM<br>
<b>To:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> [Nhcoll-l] about preservation of halite minerals in an antique colleciton<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear all, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">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?
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">with my best wishes<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Gönenç Göçmengil (PhD in geology) <o:p></o:p></p>
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<p class="MsoNormal">Istanbul Metropolitan Municipality, Projects Departments<o:p></o:p></p>
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<p class="MsoNormal">Istanbul, Turkey. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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