|Al2O3 : Cr|
|Origin||Fort Dauphin, Madagascar|
Crystallized natural corundum.
Corundum is a mineral classified on the Mohs scale as hardness 9.
It is a gem that can have various shades, red corundums are called ruby and all other colors, including pink, are called sapphire.
Their uses are not restricted to jewelry, they have been used in the manufacture of mechanical watches, in which they serve as support for the axes subjected to rotation, since their hardness resists wear by friction. They also have important industrial applications for creating helium-ruby and pure ruby lasers.
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.