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1500x in the microscope is probably like 675x in the 60mm telescopes

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Not really. Biological & research microscopes use
a 100x oil-immersion objective. With a 15x eyepiece
that's a magnification of 1500x - not unreasonable.
The resolution of microscope objectives is determined
by numerical aperture (NA) - not physical aperture.
An oil immersion lens typically has an NA of 1.25 - 1.3,
ED lenses can have 1.4 NA.

The maximum usable magnification is roughly 1000
to 1100 times the NA.

But a biological microscope is not suitable for
meteorites - they are intended for transparent
specimens.

A low-power stereomicroscope with incident illumination
is the best choice.

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