https://bereket-haileab.geology.sites.carleton.edu/files/original/8d42d645358597e1cae3b4b8b0124398.jpg 84d70ea19ea9646ab61926334ce95ee5 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 Igneous Rocks Subject The topic of the resource This collection covers both volcanic and intrusive rocks, including rhyolites, granites, diorites, andesites, basalts, gabbros, diabases, pumices, obsidians, syenites, phonolites, peridotites, carbonatites, dacites, trachyte, dunites, xenoliths, ignimbrites, and pegmatites. Creator An entity primarily responsible for making the resource Bereket Haileab Source A related resource from which the described resource is derived Housed in Anderson Hall, Carleton College. Format The file format, physical medium, or dimensions of the resource Thin sections, thin section scans, hand samples, hand sample images, photomicrographs, chemical analyses (major elements, trace elements and REE analyses for selected samples). Thin section and hand sample 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 BH250-206d Subject The topic of the resource Ijolite Description An account of the resource Major Minerals: aegirine, aegirine-augite, biotite, plagioclase Minor Mineral: sphene (titantie), apatite, opaque oxides Optical Features: Zoned aegirine-augite crystals are present, with augite cores surrounded by aegirine-rich rims. Plagioclase shows sericitization, indicating alteration. Sphene (titanite) is abundant and displays strong birefringence under cross-polarized light. Changing Conditions During Growth: As a crystal grows, the temperature, pressure, and chemical composition of the surrounding melt or fluid often fluctuate. These changes affect which elements are incorporated into the crystal at different stages of growth, resulting in compositional layering, or zoning. Source A related resource from which the described resource is derived From the rock collection of Bereket Haileab. Sample BH250-206d. Housed at Carleton College in Minnesota. Type The nature or genre of the resource Thin section and hand sample Relation A related resource <iframe width="100%" height="600" style="border: 0;" src="https://carleton.maps.arcgis.com/apps/instant/media/index.html?appid=99c4209c65b74897ba74fd3ca70fba33" frameborder="0" allowfullscreen="allowfullscreen">iFrames are not supported on this page.</iframe><br />View on ArcGIS Online <a href="https://carleton.maps.arcgis.com/home/item.html?id=99c4209c65b74897ba74fd3ca70fba33">here</a><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1XjiZkYtYqVvvyBUwR6JG49SeJbvtC1y0/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1dEjyynmOVPtFhHz1YCW4Hor03-T1WMNK/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1obyOKtvjiWgYXf-E7vz1_F4wh9gy4qxM/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/182CMhGD2PwjMgmogzeeq0m-v_kNe8W4a/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/19m592Lmn842e0P6bZ9NLG7bcekyfDDia/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1elW9xFoeBPtheae3nN0fTtuRQVOYRs-e/preview" allow="autoplay"></iframe> <br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1hC4dWdSi4JuasY_4ZPUTI48EcNwfbylO/preview" allow="autoplay"></iframe>&nbsp;&nbsp;<br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1Q3Xn62sFOxZNYi7omVXRBbsgaIphOpB9/preview" allow="autoplay"></iframe> Creator An entity primarily responsible for making the resource Bereket Haileab Aegirine Aegirine-augite Alkaline clinopyroxene Alkaline igneous rock Alkaline plutonic rock Apatite Augite core with aegirine rim Biotite Feldspar alteration igneous Igneous mineral zoning ijolite Intrusive alkaline complex mafic Opaque oxides Plagioclase feldspar plutonic Pyroxene pleochroism Pyroxene zoning Rare igneous rock Secondary sericite Sericitic alteration Sericitization of plagioclase Sericitized plagioclase Silica-undersaturated rock Sphene Titanite Zoned aegirine-augite Zoned crystals Zoning in pyroxenes