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The Menilite Opal is a curious variety of Opal that is formed by a nucleus covered by diatomite.
Diatomite is a sedimentary rock formed by the accumulation of microfossils of algae from the Miocene period.
The mineral includes a label with the name and origin and is attached to a 4 cm square cardboard box.
*The price is per unit (a single cardboard box of the four shown in the image)
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.