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MAmanenbu.bsky.social

Some nice BSE images of kalsilite, combeite and various immiscible carbonatite and silicate magmas from today's SEM session #ThinSectionThursday ⚒️

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NBvolcannick.bsky.social

Back at it for #thinsectionthursday, this time with a blueschist from Syros 🇬🇷 This is one of my favorite rocks. Not only is it pretty, but it’s offers a view of the earth we rarely see: the heart of subduction. Some of the minerals in view: garnet, glaucophane, muscovite, sillimanite, quartz. ⚒️

Rock microscope slide, or thin section, showing a metamorphic rock from Syros, Greece. Images shows white, grey, blue, and brown minerals. Scale bar indicating how large 1mm is in this field of view is placed in the bottom right.
Rock microscope slide, or thin section, showing a metamorphic rock from Syros, Greece. Images shows black, grey, yellow, green, and purple minerals. Picture taken in cross-polarized light. Scale bar indicating how large 1mm is in this field of view is placed in the bottom right.
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MAmanenbu.bsky.social

Strontianite and monazite, backscattered electrons vs cathodoluminescence. #ThinSectionThursday#geology#mineralogy ⚒️

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FGfiammefin.bsky.social

A little #ThinSectionThursday for my first post on Bluesky. Spectacularly zoned plagioclase from the Atitlán volcanic centre in Guatemala 🌋🔬

BSE image of highly zoned plagioclase crystals
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MAmanenbu.bsky.social

#ThinSectionThursday Pretty rock with monazite, strontianite, and quartz.

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OMobialik.bsky.social

#ThinSectionThursday#foraminifera#mesophotic sediments from the western Indian Ocean.

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GJgeologyjohnson.bsky.social

#ThinsectionThursday#FossilFriday#Redcar Mudstone from Redcar Beach, UK. You can see the joint between ossicles and the stereom texture quite nicely. Brown is OM, black is pyrite.

Microscope photo of a crinoid stem showing it is made from light grey calcite with a bobbly texture called stereom. The plates of the stem are connected via a curving zig zag where rounded ridges on one plate lock into the corresponding grooves of another plate. the upper right of the picture is taken up by light brown organic matter and tiny black squares of pyrite.
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DKpalaeokatie.bsky.social

Hello, here’s a thin section of a 330 million year old fossil jobby 💩 #ThinSectionThursday

Photo showing a thin section slide of a Carboniferous coprolite on matrix from Fife. To make a thin section, the rock is cut super thin, mounted on a glass slide and ground down to 0.03mm thickness (also occasionally impregnated with resin) - this means it can be analysed using a petrographic (polarising) microscope, where we can use the optical properties of minerals to aid in their ID, as well as getting detailed information on the microstructure.
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