1 10 2 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/807cc48ab93cd8cad76b2bb06a578b0a.jpg 6aac8ea3562c60bfeff5bb94c7f347ff 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>Halite</h2> Subject The topic of the resource <span>This mineral is commonly known as rock salt.</span> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>NaCl</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>cubic</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p><em>Colour in hand specimen:</em><span> </span>colourless or white when pure, more typically orange or red due to inclusions of iron compounds, and may also be grey, yellow or blue<span> </span><br class="NoSpacing" /><em><span>Cleavage:</span></em><span> perfect cubic, three planes intersect at 90°</span><span> </span><br class="NoSpacing" /><em><span>Hardness:</span></em><span> 2.5</span></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">halite</div> </div> cubic evaporite https://wserv3.esc.cam.ac.uk/p1acollections/files/original/eea0ce5b42c2fa513e4f5f9845e019fc.jpg cc4a42f011d53188d09b85125e3fe915 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>Anhydrite</h2> Description An account of the resource <div class="element"> <h3>Formula</h3> <div class="element-text"> <p>CaSO₄</p> </div> </div> <div class="element"> <h3>Structure</h3> <div class="element-text"> <p>Non-silicate</p> </div> </div> <div class="element"> <h3>Crystal System</h3> <div class="element-text"> <p><em>Crystal system:</em><span> </span>orthorhombic (+)</p> </div> </div> <div class="element"> <h3>Physical Properties</h3> <div class="element-text"> <p class="NoSpacing"><em><span>Colour in hand specimen:</span></em><span> white or colourless when pure</span><span> </span><br class="NoSpacing" /><em><span>Cleavage:</span></em><span> two at 90°</span><span> </span><br class="NoSpacing" /><em><span>Hardness:</span></em><span> 3-3.5</span></p> </div> </div> <div class="element"> <h3>Optical Properties</h3> <div class="element-text"> <p class="NoSpacing"><em><span>Colour in plane polarised light:</span></em><span> colourless</span><span> </span><br class="NoSpacing" /><em><span>Pleochroism:</span></em><span> none</span><span> </span><br class="NoSpacing" /><em><span>Relief:</span></em><span> low</span><span> </span><br class="NoSpacing" /><em><span>Birefringence:</span></em><span> ~0.04; 3^rd order blue</span><span> </span><br class="NoSpacing" /><em><span>Extinction: </span></em><span>straight</span><span> </span><br class="NoSpacing" /><em><span>Twinning:</span></em><span> simple or repeated</span></p> </div> </div> <div class="element"> <h3>Mineral Name</h3> <div class="element-text">anhydrite</div> </div> evaporite sulfur