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https://wserv3.esc.cam.ac.uk/p1acollections/files/original/12b5c18a74215d375e002f21037f4df9.jpg
113d76f170e53159aa1248482d0c7b82
Physical Object
An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types.
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
<h2>Tourmaline</h2>
Subject
The topic of the resource
<span>Tourmaline is the only common mineral of which boron is an essential constituent. Its presence in a rock, therefore, indicates that the rock contains significant boron. </span>
Description
An account of the resource
<div class="element">
<h3>Formula</h3>
<div class="element-text">(Na,Ca)(Mg,Fe,Mn,Li,Al)<sub>3</sub>(Al,Mg,Fe<sup>3+</sup>)<sub>6</sub>[Si<sub>6</sub>O<sub>18</sub>](BO<sub>3</sub>)<sub>3</sub>(O,OH)<sub>3</sub>(OH,F)</div>
</div>
<div class="element">
<h3>Structure</h3>
<div class="element-text">
<p>Ring silicate</p>
</div>
</div>
<div class="element">
<h3>Crystal System</h3>
<div class="element-text">
<p><em>Crystal system:</em><span> </span>trigonal (-)</p>
</div>
</div>
<div class="element">
<h3>Physical Properties</h3>
<div class="element-text">
<p><em>Colour in hand specimen:</em><span> </span>black<br /><em>Hardness:</em><span> </span>7</p>
</div>
</div>
<div class="element">
<h3>Optical Properties</h3>
<div class="element-text">
<p><em>Colour in plane polarised light:</em><span> </span>typically brown-green or green<br /><em>Pleochroism:</em><span> </span>strongly pleochroic in many colours<br /><em>Relief:</em><span> </span>moderate<br /><em>Birefringence:</em><span> </span>typically 2nd order</p>
</div>
</div>
<div class="element">
<h3>Rock Specimens</h3>
<div class="element-text">
<p><a href="/p1acollections/exhibits/show/metamorphic-rocks/l504">L504 Garnet schist</a></p>
</div>
</div>
<div class="element">
<h3>Mineral Name</h3>
<div class="element-text">tourmaline</div>
</div>
granite
metapelite
pegmatite