Iceland Spar is one name for the optically clear variety of calcite, also known as "optical" calcite. The rhombus shape is a cleavage piece of this mineral. This specimen is from Chihuahua, Mexico
Small Cabinet Specimen: about 3.5" x 1.2" x 2.8" (90mm x 30mm x 70mm).
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If your delicate specimen is over 70lbs we will refer you to our local Crating company for safer freight shipping!