Most Unusual Microscope Slide Ever geology rock? Fossil? Lunar? Mystery old rare

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Most Unusual Microscope Slide Ever geology rock? Fossil? Lunar? Mystery old rare:
$13.07

This beautiful mystery Microscope slide....Even under my very limited set up and low magnification is fascinating.Can anybody help identify what it is of????????It came with a collection of geology / Petrology / rock sample slides..Please see pictures..Will post worldwide..Hope somebody can edify what this is..It is beautiful to look at ..(please Help)if you can......Thankyou....