I have made two pellets of apatite, and wanted to measure the vicker hardness data. But the issue is i am unable to see the indent mark. Is this because that the pellet is white and the optical microscope is unable to reflect it rather it is scattering the incoming light. What should I do in such cases. the magnification was even 400X which is last option available. Also I placed the pellet in the optical microscope at 1000X but still not image of the pellet surface.