Preparation of a rock
The first step is to cut the original rock in order to obtain a fragment with a flat surface similar in size to that of the preparation which we require.
Once the flat surface is achieved, it must be polished to remove the roughness of the cut and make it as smooth as possible.
After the surface has been polished, it is cemented onto a glass slide with resin or Canada Balsam.
It is then recut, trying to make the second face parallel
to the first and as thin as possible.
Next, the sample is lapped until it is only 50µm thick, so that with a final polish its thickness is between 20 and 30µm.
The last stage is to cement a cover glass on top with the same material used as before, trying to ensure that no air bubbles remain trapped in between.
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