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https://bereket-haileab.geology.sites.carleton.edu/files/original/b70469fc2c706ad21b08bd0d92e79f18.jpg
0286ac920eab86e312269187fa18f1b5
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
BH250-60
Subject
The topic of the resource
Basalt; Basanite
Description
An account of the resource
Major Minerals: hauyne, pyroxene, titanaugite, plagiocalse<br />Minor Minerals: olivine, aegirine, oxide, biotite, apatite <br />Mineralogy Comments: hauyne, biotite is groundmass<br /><br />Texture: porphyritic, vesicular, zoned titanaugite<br /><br /><span><span><span>Optical Features: Titanaugite displays anomalous interference colors. Aegirine-augite zoned by titanaugite crystals. </span></span></span>Altered pyroxenes to iddingsite (clay minerals, iron oxides) due hydration and oxidation processes.<br /><br />In these thin sections, the early-formed aegirine-augite becomes unstable and is rimmed by or replaced with augite. This transformation may result from fractional crystallization, where silica increases in the melt, and/or from changes in oxygen fugacity. Under the microscope, this is evident as zoning, with greenish aegirine-augite cores surrounded by brownish augite rims. You may also observe reaction textures, such as partial replacement or corona structures, a decrease in pleochroism toward the rim (as augite is less pleochroic), and changes in extinction angles and interference colors across the grain.
<p><br />Glomerocryst, an aggregate or clump of two or more crystals (usually phenocrysts) that appear to have grown together or accumulated before or during crystallization.</p>
<p data-start="46" data-end="313">BH250-60 was specifically collected and prepared for the study of the mineral hauyne. <span>The sample was collected by Sarah Greene Hoffmann ’05 during a University of Wisconsin petrology field trip to the Canary Islands.</span> There are 15 thin sections available, each containing beautiful crystals of hauyne.</p>
<p data-start="315" data-end="625">Hauyne is a sodium-rich, sulfate-bearing feldspathoid belonging to the sodalite group. It plays an important role in the petrology of silica-undersaturated igneous rocks. Common rock types in which hauyne occurs include phonolite, nephelinite, tephrite, and hauyne-bearing basanite.</p>
<br /><br /><span>Note on Anomalous Interference Colors:</span><br /><span>Titanaugite contains significant titanium (titaniume oxides of 3.7 wt. % in this rock), which enhances pleochroic absorption. This strong absorption alters the behavior of light as it travels through the crystal, causing deviations from the typical interference colors expected from its birefringence. These anomalous interference colors are primarily due to intense absorption linked to titanium and iron content, a phenomenon known as anomalous interference coloration.<br /></span><br /><br /><iframe width="1800" height="100" src="https://docs.google.com/spreadsheets/d/e/2PACX-1vS4nyqCmZQGn3t6vX4g4nhDPwHMBaKrigt1LaY2pykWbBGXB1wNb6FYArx625I-JTtD7lyg4uz1OS1r/pubhtml?gid=161782510&single=true&widget=true&headers=false"></iframe>
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
Location: Canary Islands
Source
A related resource from which the described resource is derived
From the rock collection of Bereket Haileab. Sample BH250-60. Housed at Carleton College in Minnesota.
Contributor
An entity responsible for making contributions to the resource
Bereke Haileab
Sarah Greene Hoffmann, '05
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=4f56812635fa4cd2ac0dea827c20a924" 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=4f56812635fa4cd2ac0dea827c20a924">here</a><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/18HIGLjZ0L4x1-vHR6t2ZcU-JcQoK9RGj/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1K68SjB4150lQAp5zfBWVNKrbt519Lw9c/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1n63Jd19NgF2z_xdTetLIV00AnST61EQV/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1TA3ag_6aXYdxGAKWNXwrDTLwcQXrsQLj/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1K4cW9HnzdVLg5iqkXJz7ZRr3t9Vc5m8n/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1YUw-x65JxlqV0LphtrLwQ8v8GABUX6IP/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/13sQhfROyGpDxfCbUQGY83Y1A3J-wEfBS/preview" allow="autoplay"></iframe><br />Augite interference figure<br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1IXuwPDHUUQUDHMOPIvLUG2xNJgd_cyET/preview" allow="autoplay"></iframe><br />TAS diagram of sample 60.
Creator
An entity primarily responsible for making the resource
Bereket Haileab
Aegirine-augite
Alkali basalt
Anomalous interference colors
basalt
basanite
Canary Islands
Corona textures
Crystal zoning
Feldspathoid minerals
Fractional crystallization
Glomerocryst
hauyne
Hauyne-bearing basanite
Iddingsite (alteration product)
igneous
Isotropic minerals
Istotropic hauyne
mafic
olivine
Optical zoning
Oxides
Plagioclase
porphyritic texture
Pyroxene
Pyroxene hydration
Pyroxene replacement
Reaction rims
Sarah Greene Hoffmann '05
Silica-undersaturated igneous rock
Silica-undersaturation
Sodalite group minerals
Titanaugite
Titanaugite interference colors
Titanaugite optical properties
vesicular texture
volcanic
Zoned pyroxene
Zoned titanaugite