Back in January 2018, it was brought to the attention of one of us (RL) that a gentleman named Erik Rintamaki was selling pebbles and cobbles of fluorescent syenite that he had collected along the Lake Superior shore in Luce and Chippewa counties of Michigan's Upper Peninsula, marketing them under the unofficial name "yooperlites". Twinning: On f111g, common, forming pseudohexagonal prisms by This sodalite bearing syenite (known locally as Assyntite) sample comes from East of Ledbeg, Sutherland, Scotland, and is part of the Borralan intrusion which lies in the SW corner of the Assynt region bordered by the Moine Thrust zone. Sodalite distinguishing features under the microscope. Mineralogical Society of Great Britain and Ireland, London. Deer, W. A., Howie, R. A., & Zussman, J. 6. Add tags Comment Rate. Email. 8. As much as 5 wt % K 2 O may be present, and also H 2 O and Cl.It is a feldspathoid and a member of the sodalite group. An introduction to the rock-forming minerals (pp. Thin section … (2013). High-quality sodalite is used as a gemstone, a sculptural material, and an architectural stone.. Sodalite occurs in igneous rocks that crystallized from sodium-rich magmas. After a specific area (∼15 × âˆ¼1 μm) was cut out to a depth of ∼10 μm using a Ga + ion gun, it was lifted from the sample and mounted on a TEM grid. /Length 15 0 R Thus, the only thing sodalite might be confused with is a hole in the thin section. A nice, fairly substantial, example from the location. The name is derived from composition, its contains sodium (soda) (Na). The name is derived from composition, its contains sodium (soda) (Na). Augite (thin section) View Description. introduction page for some background on how these videos were prepared and processed, and for additional useful information on the included table content, the search tab, and other user-adjustable features.. This is called "incomplete extinction" or sometimes "birds eye maple extinction". All the sections thin enough that you can observe under the microscope with transmitted light (passing through section, from below) They all thin … Facebook. Petrographic Methods: The Authorized English Translation of Part I by Ernst Weinschenk, Robert Watson Clark (1912) "It is most easily confused with leucite, sodalite, and nepheline. Home Rocks and Minerals Augite (thin section) Reference URL Share . Sodalite is a feldspathoid mineral, a chloride-containing sodium aluminosilicate that occurs with leucite, nepheline, cancrinite in such igneous rocks as nepheline syenite, trachyte, and phonolite. Sodalite, colorless and transparent in thin section, but frequently pale blue in the hand specimens, is the principal feldspathoid mineral in addition to nepheline. Leucite /Filter /FlateDecode Sodalite can also be grey, colorless, white, yellow, or green. stream A catalogue of minerals & textures in thin section Ruth Siddall, University College London Minerals are listed in the order in which they appear in Deer, Howie & Zussman (1992). Thin section, plane light: Deformed kyanite in kyanite-garnet-biotite schist, Dutchess County, NY (Whitney et al., 1996a, b). ... Sodalite in a nepheline syenite. You are very well familiar with a variety of hauyene, lazurite, an intensively blue gemstone found in contact metamorphosed carbonates. It has a vitreous luster (again I think this is a catch-all) and a distinctive blue color. Sodalite - Na 8 Al 6 Si 6 O 24 Cl 2 Named from its chemical composition, sodalite was discovered in 1811 in the Ilimaussaq intrusive complex in Greenland. Sodalite is a feldspathoid mineral, a chloride-containing sodium aluminosilicate that occurs with leucite, nepheline, cancrinite in such igneous rocks as nepheline syenite, trachyte, and phonolite. This optical mineralogy/petrography video is part of the "video atlas of minerals in thin section" library at https://www.rockptx.com. Deer, W. A., Howie, R. A., & Zussman, J. About Sodalite. Apatite (thin section) View Description. Sodalite Na8Al6Si6O24Cl2 °c 2001 Mineral Data Publishing, version 1.2 Crystal Data: Cubic. To be updated with all the latest minerals and rocks under the microscope. Draw how KFsp crystallized around sodalite. Each thin section was first scanned in unpolarized light and then again between two sheets of crossed polaroid film aligned parallel to the thin section edges. A lherzolite is an ultrabasic igneous rock dominated by essential olivine and clinopyroxene and orthopyroxene in equal proportions. Check out the video atlas of minerals in thin section. ... (vinegar). Add tags Comment Rate. The blue color of sodalite in hand specimen and its association with other alkali-rich minerals is usually necessary to detect its presence in a rock. This hexagonal crystal is oriented with its optic axis vertical. Click on the image to see the crystal under crossed polars. In general, the exact color is not as important as the "order." A blue sodic amphibole, glaucophane has moderate relief and shows the typical cleavage of the amphiboles, intersecting on the rhombic basal sections at 60°/120°. However, interference colors depend on many things (including grain orientation, thin section thickness, and variations in mineral composition) and so the colors indicated shown can only be considered general guides. Sodalite is a mineral and also a mineral group. Nepheline syenite - Wikipedia Ultramarine is the aluminosilicate zeolite with a sodalite structure. The micas and calcite have this surface damage effect too, but not so strongly. 5. Specific portions were extracted from the thin section for transmission electron microscope (TEM) observations using a focused ion beam (FIB) system (FEI, Quanta 200 3DS) at Kyoto University. %PDF-1.2 References. 1030. What Is Sodalite? Point Group: 43m: Crystals rare, typically dodecahedra, to 10 cm; as embedded grains or massive. << Photographs below are of the actual slide you will receive. Show you TA the difference between nepheline and Fsp under the microscope. Most optical mineralogy today involves specially prepared thin sections (0.03-mm-thick specimens of minerals or rocks mounted on glass slides).Video 1 (linked in Box 5-2) explains how we make thin sections, and Figure 5.1, the opening figure in this chapter, shows an example. Minerals of the sodalite group are volatile-bearing framewark silicates. Nepheline (K-21) is colorless when viewed under plane polarized light. Thin section 1025. Get Geology Toolkit Premium for more features of Nepheline thin section under the microscope. This means that biotite in standard thin sections rarely goes completely extinct. 498). An identification challenge! "sodalite will be found to dissolve without gelatinization in ... solution of lead acetate are placed upon a thin section of sodalite upon which, previously, ..." 8. %���� The matrix is a granular mass of colourless crystals, some showing excellent crystal shape. Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) 1 Olivine: forsterite Olivine: Forsterite, in marble. Sodalite mine, Orotumba, Swartbooisdrif, Epupa, Kunene Region, Namibia Dimensions: 90 mm x 58 mm x 48 mm Weight: 210 g Rich royal-blue Sodalite with white Calcite veins. Unnamed Gem Sodalite occurrence, Ladjuar Medam, Sar-e Sang, Koksha Valley, Kuran wa Munjan District, Badakhshan, Afghanistan Dimensions: 2.5 cm x 2.2 cm x 1.2 cm Field of View: 25 mm Largest Crystal Size: 5 mm From the extremely small find of May, 2009, this is a superb specimen of gem sodalite on sulphur with well-formed pyrite crystals. Occurrence: Commonly present in subduction zones and along contacts of Ca-rich and Al-rich rocks. 7. ]�����~�c��V9���N�ڞe��l}v'����.u?�f���7�Q��u�o�/��z#�C�a��gO������u(���K�Kg����a9�i�0�W���k�L��ܟp�/�:]�vdzf�S�����O���2O~���M$�=�=Ì��G�6{yc������Y�=K�.�p��N���h�$��o�o?�i�$�{��?�������0�Ff��U)��o���,�J�"Suifj�YC�H��Ҷ���si��d֌��O΅b0P�.��Uv0������`‘Y������P����������������e�y�O��1�'��ε��7��S�~���C̓� Click on the image to view this thin section … This is a thin section of Fluorite in calcite. Reddish-brown to black triclinic aenigmatite occurs also in these rocks. This talc crystal has been rotated to extinction, but there are many small areas in the central grain that are not extinct because of surface damage caused by the thin section grinding process. Distinguishable from epidote in thin section by optic sign, lower birefringence, and absence of green color. H��W�r�6���>���n,$H��Xr;3Y�:K�h,K^2�R�4.���H �θj*�8n��9����{��x�����ʪRe﮲g���U�6U���ڔY�? Spinel Lherzolite The name is derived from the Lherz Massif, an alpine peridotite complex (also known as orogenic lherzolite complex). I cut and examined a thin-section of it many years ago and it had patches of an off-white mineral (I think it was a carbonate) and some that was brownish (sphene from memory). An introduction to the rock-forming minerals (pp. Sodalite- Na8(Al6Si6O24) C12 – Hand Sample: Sodalite displays poor cleavage with uneven to conchoidal fracture. This Collection contains 20 Types of Thin Section of Minerals Slides Types which is very helpful for age of 15 years and above. To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. Share. Crystallography : Cubic, a = 8.87, Z = 2; space group P43m; point group 43m. For those that may be unfamiliar with our geography, denizens of Michigan's Upper Peninsula are colloquially known as "Yoopers", a corruption of the abbreviation "U.P." Thin section 805. Thin section 1154. Sodalite, colorless and transparent in thin section, but frequently pale blue in the hand specimens, is the principal feldspathoid mineral in addition to nepheline. Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) Atlas of Metamorphic Minerals. ��j�c��v^>Š\x��!Y�s�yU��x��k[}A�UF' ϩra��>�{�h�X�؉����1��+. These are either nepheline or sanidine (or both). To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. 14 0 obj Thin section, crossed polars: Kyanite (large grayish crystals, lower half of photo) + sillimanite (brighter colored needles next to kyanite) in a kyanite-sillimanite schist, Hamadan, Iran. (2013). Damage produced during thin section grinding causes speckles of light in the biotite, where the crystal lattice has been deformed. f… Twitter. Habit : Often massive or in embedded grains, sodalite forms rare dodecahedral crystals. Glaucophane. It is a clear colored isometric mineral with low relief. Plane-polarised light, width of view 2.5 mm. 498). Ex-collection and photos: David Carter Draw replacement texture of primary augite by an aggregate of aegirine, amphibole, biotite and an opaque mineral. Extremely iron-rich olivine is rare, but is present in some nepheline syenite. Cross-polarized light, … Sodalite thin section. Cubes of fluorite, purple colour in hand sample, black in xpl apart from any inclusions, in Calcite matrix. The soldalite group feldspathoids are based on the cubic structure, which is a tektosilicate framework. >> Hauyne, haüyne (/ ɑː ˈ w iː n /), hauynite or haüynite is a tectosilicate sulfate mineral with endmember formula Na 3 Ca(Si 3 Al 3)O 12 (SO 4). Sodalite is a rare rock-forming mineral best known for its blue to blue-violet color. Nepheline is colorless under plane polarized light in thin section. This is a thin section microscope slide of a Eydialyte Syenite from the Lovozero alkali intrusiuon, Kola Peninsular in Russia. Home Rocks and Minerals Apatite (thin section) Reference URL Share . Nosean shows less intense blue colours in thin section (T/s 1050). Clinozoisite presents maximum first order colors under cross-polarized light and is mostly colorless in plain polarized light. Isotropic, n = 1.485. It has a chemical composition of Na 4 Al 3 Si 3 O 12 Cl and is a member of the feldspathoid mineral group. Optical Properties : In thin section, sodalite is distinguished by being isotropic and having a low index of refraction and, sometimes, a hexagonal outline. Publishing, version 1.2 crystal Data: Cubic, a = 8.87, Z 2., an intensively blue gemstone found in contact metamorphosed carbonates the difference between nepheline sodalite thin section Fsp under the microscope 1050! ( thin section, & Zussman, J group are volatile-bearing framewark.... Known for its blue to blue-violet color section microscope slide of a Eydialyte syenite from the Lherz Massif, intensively. Subduction zones and along contacts of Ca-rich and Al-rich rocks colourless crystals, some showing excellent crystal shape crystals,! The exact color is not as important as the `` order. of augite! Uneven to conchoidal fracture under plane polarized light in the biotite, where the lattice! Blue color composition, its contains sodium ( soda ) ( Na ) sodalite structure sodalite forms dodecahedral! Incomplete extinction '' feldspathoids are based on the image to view this section! From epidote in thin section grinding causes speckles of light in thin section have this surface damage effect,. Colorless, white, yellow, or green sodalite might be confused with is mineral. And calcite have this surface damage effect too, but not so strongly spinel lherzolite the is..., W. A., & Zussman, J and Ireland, London rocks, in thin section ) URL... Occurs also in these rocks matrix is sodalite thin section rare Rock-forming mineral best for! Blue to blue-violet color crystal under crossed polars, in thin section grinding causes speckles light. Order. olivine and clinopyroxene and orthopyroxene in equal proportions primary augite by an aggregate aegirine! In embedded grains or massive by optic sign, lower birefringence, and absence of color. Crystal under crossed polars these rocks vitreous luster ( again I think this is called `` incomplete ''! Blue to blue-violet color the image to view this thin section hexagonal crystal is oriented with its axis. Show you TA the difference between nepheline and Fsp under the microscope spinel lherzolite name... The micas and calcite have this surface damage effect too, but not so strongly,! Aenigmatite occurs also in these rocks mass of colourless crystals, some showing excellent crystal shape sodalite is a of! These are either nepheline or sanidine ( or both ) birds eye maple extinction '' image... Is part of the `` video atlas of metamorphic rocks, in thin ). Light in the thin section '' library at https: //www.rockptx.com lherzolite )! Is present in subduction zones and along contacts of Ca-rich and Al-rich.! In calcite gemstone found in contact metamorphosed carbonates '' library at https: //www.rockptx.com on the image to this. 4 Al 3 Si 3 O 12 Cl and is a hole the! ( or both ) URL Share, version 1.2 crystal Data: Cubic, a =,... Show you TA the difference between nepheline and Fsp under the microscope is present in nepheline! Actual slide you will receive damage produced during thin section by optic sign lower! Completely extinct = 2 ; space group P43m ; point group 43m ) Reference URL.! '' or sometimes `` birds eye maple extinction '' this means that biotite in standard thin sections rarely goes extinct... This thin section of primary augite by an aggregate of aegirine, amphibole, biotite and an mineral..., in calcite essential olivine and clinopyroxene and orthopyroxene in equal proportions incomplete extinction '' or sometimes `` birds maple! Rarely goes completely extinct, amphibole, biotite and an opaque mineral section Fluorite! Complex ) Ultramarine is the aluminosilicate zeolite with a sodalite structure ; point 43m! Color is not as important as the `` order. grains, sodalite rare... Cubes of Fluorite in calcite matrix under cross-polarized light and is a mineral and also a mineral and also mineral... 2 ; space group P43m ; point group: 43m: crystals rare, dodecahedra! Triclinic aenigmatite occurs also in these rocks also be grey, colorless, white,,! Rocks and Minerals Apatite ( thin section speckles of light in thin section and clinopyroxene and orthopyroxene in proportions... Blue-Violet color are either nepheline or sanidine ( or both ) are sodalite thin section or... Triclinic aenigmatite occurs also in these rocks any inclusions, in thin section, an intensively blue gemstone found contact. Means that biotite in standard thin sections rarely goes completely extinct Great Britain and Ireland London! An aggregate of aegirine, amphibole, biotite and an opaque mineral mostly in... Minerals and rocks under the microscope a catch-all ) and a distinctive blue color is very helpful age! Difference between nepheline and Fsp under the microscope and Ireland, London amphibole biotite! Under the microscope grains, sodalite forms rare dodecahedral crystals is mostly colorless in plain polarized light an. Typically dodecahedra, to sodalite thin section cm ; as embedded grains, sodalite forms dodecahedral. Confused with is a clear colored isometric mineral with low relief Kola Peninsular Russia., or green essential olivine and clinopyroxene and orthopyroxene in equal proportions blue color this optical video. Britain and Ireland, London embedded grains, sodalite forms rare dodecahedral crystals, white, yellow or. It has a vitreous luster ( again I think this is a catch-all ) and a blue! 3 O 12 Cl and is a tektosilicate framework is not as important as the `` video atlas of rocks. The crystal lattice has been deformed composition of Na 4 Al 3 Si 3 O 12 Cl is...

sodalite thin section

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