Massive dark or black Onyx.
Onyx is considered a variety of agate or chalcedony and can come in different colors such as green, red or white, with or without banding.
It is mainly used in jewelry and decorative items.
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.