Reddish crystallized quartz.
It is a variety of quartz with ocher, brown and red tones. Its color is due to the fact that in its composition it has part of Hematite or Limonite that gives it the reddish tone.
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.