Aragonite (aka Flos-Ferri) - Santa Eulalia, Mexico (MS-2751a)

Aragonite chemically identical to Calcite.  And, going back as far as Roman times was known for its beauty and hardness...leading to the name Flos-Ferri (Flowers of Iron).  Measures about 11cm x 9cm x 7cm.

Will require a USPS Medium Priority Mail Flat Rate box.  But, likely leaves room for additional items in the box.