Geological Thin Sections
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This is a gallery of petrographic thin sections.
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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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NWA7308 is an LL3 ordinary chondrite from North West Africa, found in 2012. The gigapan comprises 113 images taken on a Nikon D60 using direct eyepiece projection from a Zeiss microscope and luminar objective. The image was put together using PTGUI. ordinary chondrite: A major class of chondrites, distinguished by s...
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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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The orthomagamatic sulfide deposit at Kambalda is hosted within komatiitic lavas. These ultramafic rocks are high volume melts and so can include a large amount of metal sulfide, normally a restite phase. Crystallisation of the komatiite melts was assocaited with the development of high supersaturation with respect to ...
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Thin section of fine grained talus from a landslip in Glen Dochart, near Crianlarich, Perthshire, Scotland. The diameter of the core shown is 38mm. The thin section is has been photographed under crossed polars. Using the ureolytic bacterium Sporosarcina Pasteurii the loose material has been biocemented by calcite prec...
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Thin section of a 5mm diameter core of quartz sand which has been cemented using the ureolytic bacterium Sporosarcina Pasteurii. Porosity is picked out by blue dyed epoxy. The photographs have been taken using crossed polars. The loose material has been biocemented by calcite precipitation induced by the bacteria durin...
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Thin section of a 5mm diameter core of quartz sand which has been cemented using the ureolytic bacterium Sporosarcina Pasteurii. Porosity is picked out by blue dyed epoxy. The loose material has been biocemented by calcite precipitation induced by the bacteria during ureolysis. Calcite crystals can be seen as small gra...
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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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Thin section of lunar basalt collected by Apollo 12. Field of view is approximately 8 by 6 mm. Crossed polars. Taken with the automated imaging system at Williams College.
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Thin section of medium gray, holocrystalline, clast rich breccia which has been well-sintered. Approximate field of view is 8 by 6 mm, crossed polars. Collected by Apollo 12 80 m NNW of the Lunar Module. Taken with the automated imaging system at Williams College.
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