Contact between two minerals also causes relief

 

In image A, grain (1) clearly stands out from the mass (mineral 2) in which it is immersed, their refraction indices are evidently different. Mineral 2 acts in the same way as the Balsam did previously.

In image B, there is no relief between minerals 2 and 3. Mineral 4 shows a sharp relief in relation to mineral 1 and moderate in relation to 2, which in turn is low in comparison to mineral 1.

 

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