Apr 11, 2024
Week 1 of posting thin sections. This is an old photo when I was new to taking photos through a microscope lens. Cross polarised plane. I would like to know what people think this rock is!
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Week 1 of posting thin sections. This is an old photo when I was new to taking photos through a microscope lens. Cross polarised plane. I would like to know what people think this rock is!
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This is a thin section photomicrograph of one of the lunar mare basalts that was sampled on the Apollo 12 mission. Notice the high olivine content! You can discover some more about this sample by using its identifier, located in the top left corner. Enjoy!
(Let me know if you’d like to see an annotated version)!
Also- quick revision- the field of view is actually 1 mm.
ROCK ON!
[Photomicrograph Credit: Me]
~ :) ~
i'll do better next time
Ooid Wednesday But what is an ooid? Ooids are spheroidal sedimentary grains composed of calcium carbonate or iron such as these ooids from a banded iron formation.
A little video i took last year of a calcite crystal under a cross polarised microscope. I believe the FOV is around 2mm in diameter.
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Watch as a thin slice of rock is gradually polished thinner, getting the thickness exactly right allows different minerals to be identified.
mr.geologyHere I have one #thinsectionsample. And in each "phase" you'll see this sample getting thinner. Checking to see if you can identify any chemical or physical mineral properties, you grind the thin section and check regularly until you get the right interference color (this is quartz, therefore should show a maximum interference color of a pale yellow) When it's this thin go very slow or you'll ruin it like I did in my last post. The sample is very fragile and brittle. especially when you are close to the correct thickness! It's quite easy to go from slightly too thick to slightly too thin.
Learn the pieces of equipment used in petrographic thin section preparation. Call National Petrographic for more details about their thin section services.
Learn more about the pieces of equipment used in petrographic thin section preparation.
The experts at National Petrographic appreciate the importance of careful analysis. Learn helpful details from this brief introduction on thin section preparation.
Discover helpful details from this brief introduction on thin section preparation.