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Sixty of these rare objects will be on view, including an amethyst from the Goboboseb Mountains in Namibia, a rhodochrosite from Colorado and a tourmaline cluster from Brazil.

The exhibit includes some spectacular examples, like an intense blue-green chrysocolla; a pockmarked, deep orange crocoite; and a glittery, blood-red chunk of rhodochrosite.

Sotheby’s said that the stones on the manuscript’s cover are rhodochrosite, which Rowling notes at the end of the volume are “traditionally associated with love, balance and joy in daily life”.

Bound in brown Morocco leather, the copy is adorned with silver ornaments with a skull in the center and has seven mounted rhodochrosite stones, according to Sotheby's.

Those looking for a piece of rhodochrosite–many mineral collectors want to own at least one–can find one here from the Sweet Home Mine in Colorado, which has also closed.