https://bereket-haileab.geology.sites.carleton.edu/files/original/c24e79b749a001892d830bd1dd5d80f2.jpeg 1b4dc3a892d695602334fd93553b6cba 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 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 BH250-8 Subject The topic of the resource Tuff Description An account of the resource Major Mineral: hornblende <br />Minor Mineral: clinopyroxene altering to chlorite, sanidine, titanite, sericite, calcite, apatite<br />Click <a href="https://www.digitalscope.org/ViewerUI/?SlideId=6ebde66b-c6cc-4d73-9f0d-d3b95ab923e9">here</a> for a high resolution scan<br /><br /> <p>BH250-8 is a strikingly beautiful tuff with rich mineralogical features. It contains basaltic hornblende—some crystals showing zoning—as well as both orthopyroxene (OPX) and clinopyroxene (CPX), with some CPX grains displaying anomalous interference colors. Scattered quartz grains are also present. Plagioclase feldspars exhibit alteration to sericite, while portions of the pyroxene have altered to chlorite. Accessory minerals include sphene (titanite) and exceptionally large, well-formed apatite grains—some cut parallel and others perpendicular to the c-axis, clearly revealing basal cleavage. Secondary calcite occurs along veins and voids, and the groundmass contains devitrified and recrystallized volcanic glass. This is a particularly beautiful and mineralogically diverse sample.<br /><br />There are several apatite crystals cut parallel to the C-axis that can be used to determine, length fast, length slow optical property as seeing in the video.</p> Source A related resource from which the described resource is derived From the rock collection of Bereket Haileab. Sample 8. Housed at Carleton College in Minnesota. Type The nature or genre of the resource Thin section Relation A related resource <iframe width="100%" height="600" style="border: 0;" src="https://carleton.maps.arcgis.com/apps/instant/media/index.html?appid=a0a0bd40ee6449d08239c495b3b69bb1" frameborder="0" allowfullscreen="allowfullscreen">iFrames are not supported on this page.</iframe><br />View on ArcGIS Online <a href="https://carleton.maps.arcgis.com/apps/instant/media/index.html?appid=a0a0bd40ee6449d08239c495b3b69bb1">here</a><a href="https://carleton.maps.arcgis.com/home/item.html?id=056af387bc7d45bfa762ccd20d45d96b"></a><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1l1qnS723ph71--VAF8_tRN7Le8kF1tuk/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1RLGeQ-VcaA7zH_smwNBkhCsStR0373xF/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/16yGJO2oSAeTCLLqrpCFhaXAqKyT2QPiY/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1AvJn02wCKcxl5B1SH2pDX0CbCUhdn8jo/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/14ys7YVosrwZHm8btnye6V3icL0Yat75H/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1KFSPbximkQlk4u5dP6npU1vcpwNzmSMz/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1WShR3AY9pJWG9emTk9UJJ9wxRjBoBiUX/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1GIwdoePJw8pxnya8ASrhnBiqGe8H-TgX/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/16QhBGImpt3pfYPi4NncYW_s2_fKJGZC7/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1_MRN8sEFPw-pKXoHYRjRxiI3CV0nQuDy/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1d4vuWNWZ0y9bJ-b8P4odEB8JdYlOekWI/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1jKnVwGcI6KjmDOWoVWQZoJBEEKxN9U7H/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1mk0r0kcv46_RnyQn4f73Y3RdJIokn-TD/preview" allow="autoplay"></iframe> Creator An entity primarily responsible for making the resource Bereket Haileab Alteration (sericite Anomalous interference colors Apatite basalt Basaltic hornblende chlorite) Clinopyroxene (CPX) Devitrified Glass Hornblende igneous length fast length slow mafic Orthopyroxene (OPX) Recrystallization Titanite (Sphene) Titanoaugite tuff volcanic volcaniclastic welded tuff Zoned minerals