27 10 264 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/. Description An account of the resource This glossary describes a number of geological terms with which the 1A students should become familiar. It is by no means an exhaustive list, but is aimed to help you understand the material within the first year course. Title A name given to the resource Glossary 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>Zonation</h2> Subject The topic of the resource As a crystal grows slowly in a magma chamber the magma from which it is crystallising may evolve, changing its composition. Thus later crystallising regions or “zones” of the crystal will have a slightly different composition from earlier crystallising regions. The crystal thus displays zonation. Zonation is seen under cross-polarised light by variations in the birefringence colours of the different zones. Description An account of the resource Have a look at the granodiorite (<a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/8">L120</a>) in the 1A Reference Series. https://wserv3.esc.cam.ac.uk/p1acollections/files/original/29f822c37a1f2f22aecf08ab9ddcad85.pdf 0f3d81bba57b4650a1a2781dc0c4bc86 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 Chronostratigraphic Chart https://wserv3.esc.cam.ac.uk/p1acollections/files/original/3f8f02288db286084d1387e652ff1b88.pdf fea2b86af3cc8db11df9d23f60fb6b50 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 Michel-Levy Chart 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/. Description An account of the resource This glossary describes a number of geological terms with which the 1A students should become familiar. It is by no means an exhaustive list, but is aimed to help you understand the material within the first year course. Title A name given to the resource Glossary 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 Pleochroism Subject The topic of the resource Some minerals are pleochroic. When rotated under plane polarised light they change colour. Biotite and the amphibole hornblende are pleochroic. Description An account of the resource Have a look at <a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/50">hornblende amphibole</a> (M201, M211) and <a href="https://wserv3.esc.cam.ac.uk/p1acollections/items/show/52">biotite mica</a> (M303, M304) in the 1A Reference Series.