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https://bereket-haileab.geology.sites.carleton.edu/files/original/7437731c344d74f5b8e490a68e111efe.jpg
17b629047dc4d191dea65b1786b85372
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
BH250-206a
Subject
The topic of the resource
Ijolite
Description
An account of the resource
Major Minerals: aegirine, <span>aegirine-augite, </span>plagioclase, biotite, nepheline <br />Minor Mineral: sphene, apatite, chlorite, calcite (secondary)<br /><br />Optics: In this thin section, b<span>iotite displays striking bird’s-eye maple extinction and strong pleochroism. There are biotite grains cut perpendicular to the c-axis are ideal for obtaining centered and off-centered optic axis figures. Sphene (titanite) exhibits extremely high birefringence, producing vivid interference colors. There are well-formed nepheline crystals that provide an excellent teaching example for distinguishing nepheline from quartz. Apatite inclusions within biotite show radiation damage, evidenced by pleochroic halos. Aegirine presents anomalous interference colors.</span><br /><br /><iframe width="1800" height="100" src="https://docs.google.com/spreadsheets/d/e/2PACX-1vS4nyqCmZQGn3t6vX4g4nhDPwHMBaKrigt1LaY2pykWbBGXB1wNb6FYArx625I-JTtD7lyg4uz1OS1r/pubhtml?gid=2094297467&single=true&widget=true&headers=false"></iframe>
Source
A related resource from which the described resource is derived
From the rock collection of Bereket Haileab. Sample BH250-206a. 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=31017fd9994e44088051a935976f7990" 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=31017fd9994e44088051a935976f7990">here</a><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1yuCIX5DVxZagQM6rLLkoX5RuRLlpgUXv/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1XR28Mo3xAHir0uGv99iNq4VIsAvBrsNa/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1FWWZDSgyYyuid2UxGDKKwQqp_KbKmHH_/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1nfoSE3ctI-IBtqAWlD_ETpuWzQy19SCk/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1vuSjEySKA3_6x3_HLPJ88JWEfbY8jtfM/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1U1M6SJhXFklDUdDTjnl7j7WssEfOQ9mc/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1tZFE35Q43eu4OtuB0Sb7_rd5wl4tP7kZ/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1bBOFMQ_3YhSrq6UF8oeS93FghTC16aYs/preview" allow="autoplay"></iframe> <br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1dMgCVjZohDCPxs579SmYCpS5OIkoUc-M/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1c8NdJGzl_TmiSRzYNo66NJkuGdwTP0qo/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1xI7jIUlv64N6mnNaAWJZEW9HOzbeGjI9/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1EN2l54i9gouKGQdKsyFDeT-tRPcgDe5N/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1XZOFzmUP4qJ8eXaZm7WEMl7NfHJFrLvB/preview" allow="autoplay"></iframe><br />TAS diagram of sample BH250-206a.
Creator
An entity primarily responsible for making the resource
Bereket Haileab
Contributor
An entity responsible for making contributions to the resource
Bereket Haileab
Accessory phosphate minerals
Aegirine
Aegirine anomalous interference colors
Aegirine-augite
Alkaline complex
Alkaline igneous rock
Alkaline plutonic rock
Alkaline pyroxene
Alkaline pyroxene birefringence
Anomalous interference colors
Apatite
Apatite radiation damage
Biotite
Biotite optic axis figure
Biotite pleochroism
Bird's eye
Bird’s eye maple extinction
Bird’s-eye maple extinction (biotite)
Chlorite
Diagnostic nepheline optics
Euhedral nepheline
Feldspathoid minerals
Feldspathoid-rich rock
Ferromagnesian silicates
Foid-bearing intrusive rock
igneous
Igneous petrology
ijolite
mafic
Nepheline
Nepheline syenite family
Nepheline vs quartz identification
Plagioclase feldspar
Pleochroic halo
plutonic
Radiation halos
Silica-undersaturated rock
Sphene
Sphene high birefringence
Titanite
Titanite interference colors