tourmaline
Tourmaline is one of the birthstones for October.
It is a gemstone with so many color variations that it is said that there is no such thing as a non-existent color, and some gemstones show multiple colors within a single stone.
It has the property of generating static electricity when heated, and its Japanese name is "tournament stone."
Some are called by specific names depending on their color.
Karatz GemMagazine
" Tourmaline "
Karatz GemMagazine
" Tourmaline "