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[Antonio García Jiménez]

All these figures are constellations of stars and in each of the figures there is a star, sometimes two or three, which are what give their medicinal virtue to the different precious stones.

This book is the greatest medieval parallel to Voynich. Of course I do not believe that any document appears that explains the VM, but we can conjecture with a good basis that the VM is an astrological herbal just like the astrological lapidary of King Alfonso. Both have a healing purpose.