Crystallized Spathic Calcite.
Spatic Calcite is a translucent and rhombohedral variety, easily exfoliable.
It presents the optical property of birefringence, that is, it has a double refraction. According to this, if a word or line is written on a piece of paper and the mineral is passed over it, the image will appear twice.
The mineral includes a label with the name and origin and is attached to a cardboard box. 4 cm square.
*The price is per unit (a single cardboard box of the four shown in the photo)
Since the minerals are natural, you will receive a piece similar to the one in the photograph. The minerals come in cardboard boxes and are glued to a porex base with hot silicone; these can be removed using ethyl alcohol without damaging the mineral. The size is approximate.