TOURMALINE "ELECTRIC" BLUE AND GREEN, Mina da Batalha (Paraíba) (miniature)

Tourmaline is a crystalline silicate mineral group characterized by the presence of boron combined with elements like aluminum, iron, magnesium, sodium, lithium, or potassium. This gemstone is known for its extensive range of colors.

The term "tourmaline" originates from the Sinhalese word Thoramalli, which pertains to carnelian gemstones.