Geological Thin Sections
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This is a gallery of petrographic thin sections.
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This is a thin section of dunite, a rock made up almost entirely of the mineral olivine, as seen in cross-polarized light through a Leica Z6 APO Macroscope. There is a band of black mineral grains to the left of center of the image that is a cumulate layer of the mineral chromite - in the magma chamber from which thes...
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- 111
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Greisenised granite from Cornwall. Not the prettiest rock, but one for the teaching collection. Some nice feldspar alteration textures here. Greisenisation is alteration assocaited with hydrothermal fluid flow and, in Cornwall, Sn and W mineralisations around granites. 228 images using a Zeiss Luminar lens on a Meiji ...
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- 308
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- 88
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Thin section from a mylonite in the North Paint Rock Creek Lineament, Bighorn Mountains, Wyoming. Includes a breccia of mylonite pieces.
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- 46
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Photography equipment www.flickr.com/photos/65726513@N00/4256483956
/ and some individual images www.flickr.com/photos/65726513@N00/sets/72157621561740468 / One thin sections is 31 mm wide, and the pixel size is 0.007 mm. Same sample is photographed with plane light and crossed nicols.-
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- 33
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Thin Section Photograph, with crossed polars, of Norite taken with the automated imaging system at Williams College. Field of view is approximately 20 by 30 mm. Leica microscope, Nikon camera, and custom designed and built stage adaptor with stepper motors. Mineralogy consists of two pyroxenes (ortho-pyroxene and ...
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- 408
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- 17
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Thin section image of a classic layered sequence from the Rum layered Intrusion. The way up is peridotite (multicoloured) at the top and anorthosite at the bottom. The band of opaque phase crossing the center of the sample is a chromitite band. Injection of a slug of picritic magma, plus magma mixing or incorporation o...
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This is a thin section of dunite, a rock made up almost entirely of the mineral olivine, as seen in cross-polarized light through a Leica Z6 APO Macroscope. There is a band of black mineral grains to the left of center of the image that is a cumulate layer of the mineral chromite - in the magma chamber from which these...
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- 2628
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- 1
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Thin section view of a granitoid from the southern Sierra Nevada Batholith.
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- 2302
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- 1
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Shear zone in polarized light, same image, brighter whites and darker blacks.
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- 1
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This is a microscopic view of the Barratta Meteorite in cross-polarized light. Original Imagery courtesy of Bob Walker and *** Thin section courtesy of **** I'll get the other names soon
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