The origin of the word “tourmaline” is the Sinhala (Sri Lankan) word turmali, meaning “multicolored.” Tourmaline is a mineral composed of: aluminum with boron silicate, additives of iron, lithium and manganese. One of the most variegated gemstones: found in all colors, however the most popular are red, green and multicolored ones. It has pyroelectric, thermoelectric and piezoelectric properties. You can change the color during heating (greenish hues darken, brownish red turn to a more defined red, pinkish hues become colorless). All varieties of tourmaline are more or less characterized by pleochroism (this is the dependence of the color of the material on the direction and polarization of the light wave propagating in it; it is of different colors when viewed in a crystal illuminated by white light). Tourmaline crystals are prismatic (with striped walls), punched, needles up to 40 cm. in length. Their gloss tends to be glassy.
Their hardness according to Mohs scale – 7; The Mohs scale is used to determine the hardness of various minerals. A mineral with a higher value on this scale will leave a mark on the surface of a mineral with a lower value. Widespread in granites, pegmatites; some strains of tourmaline are found in metamorphic rocks. The most widely used elbaite – red, green, multicolored; pink and green tourmaline, properly sanded, can have a cats eye effect. Tourmaline a stone for those born in October. The stone is very colorful; the Egyptians thought this was because the stone “traveled” from the center of the Earth through the rainbow; in some countries people stone and call tourmalines “rainbow gems”. For centuries, the stone has been a sign of miraculous love and friendship. Tourmaline is the cornerstone of the eighth anniversary of marriage.