Disclaimer: I believe to have checked this riddle for errors,
but I can't guarantee that the solution provided is correct, that the solution provided is the only possible solution
or that a solution exists at all...
Anyway, go ahead and try!
Sapphire is hexagonal and from Kenya. The isometric crystal is not Andalusite and it doesn't have Mohr value of 9. The crystal with specific gravity of 3.2 and Mohr value of 7.5 is from Canada. The crystal with specific gravity of 2.65 is not Andalusite. The triclinic crystal is from Brazil and has Mohr value of 7. Rock Crystal is not orthorhombic. Grossular is from Mexico and has specific gravity of 3.6. The crystal with Mohr value of 6.5 is not hexagonal, while the crystal with Mohr value of 9 has specific gravity of 4.
Which structure does the Mexican crystal have?
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