Rough Wolframite crystals.
Tungsten is a metal that is very hard and has the ability to withstand heat. It is used in cutting tools to pierce other metals. It is also suitable for machine components, but its greatest use is as the metal mostly used in filaments for incandescent lamps, and reflectors.
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.