1 10 1 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/cd0887d0796095eddd0dc41b3db1e1dc.jpg 8e4939397352f33d03d66ea841e757b9 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/8299c6ff44bb9caa79c67702c74cb2c5.jpg 656cbb57478c378eff753a41a68050dd https://wserv3.esc.cam.ac.uk/p1acollections/files/original/6c4bb513fcf8f9af3b246a26e3b77ab6.jpg 4fcf5efddbe66c008e446fbb8eee5448 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><strong>L361<br /></strong></h2> <h2>Oolitic ironstone</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Jurassic</p> <h3>Location</h3> <div class="element-text"> <p>Inferior oolite<br />Thrapston, Northamptonshire</p> </div> </div> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>This rock is made up of light grey sub-spherical<span> </span><a href="/p1acollections/items/show/230">ooids</a>.<span> </span><br />Fine to medium sand grain size.<span> </span><br />A few lithic/biogenic fragments.<span> </span><br />Dark grey cement.<span> </span><br />Small hair-line white veins run through this rock.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>Ooids made up of a greenish sheet silicate mineral called<span> </span><span>chamosite</span>, partially altered to<span> </span><span>siderite</span><span> </span>and<span> </span><span>limonite</span>. Concentric structure. Central cores of fine-grained material.</p> <p>A layer formed of brown, transparent crystals, sometimes with rhombic cross-sections surrounds the peripheries of many ooids. This is<span> </span><span>siderite</span>.</p> <p>Some quartz grains.</p> <p>The cement is made up mainly of carbonate (<span>siderite</span>), with a small quantity of a green-brown material, which has anomalous interference colours.</p> <p>This rock is a grainstone (Dunham naming system) or oo-sparite (Folk naming system).</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">Deposited in a moderate energy, marine energy.</div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p><span>Chamosite</span><span> </span>is an Fe-rich chlorite, often greenish. It is a sheet silicate.</p> <p><span>Limonite</span><span> </span>is amorphous or cryptocrystalline, and yellow-brown to brownish-black in colour. It comprises hydrated iron (III) oxides with a range of compositions.</p> <p><span>Siderite</span><span> </span>is iron carbonate (FeCO₃). It is often difficult to distinguish siderite from calcite and dolomite optically.</p> </div> </div> <div class="element"></div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">oolitic ironstone<br />oolite</div> </div> marine moderate energy ooid