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Tourmaline
Group: Silicates - cyclosilicates
Chemical composition: Na(Mg,Fe,Li,Mn,Al)3Al6(Bo3)Si6O18(OH,F)4
Colors: Black, green, brown, red, blue, yellow, or pink.
Hardness: 7 to 7.5
Formation: Hexagonal/trigonal crystal; Prismatic, acicular form
Principal Sources: Brazil, Madagascar, Mozambique, Russia, Afghanistan, Pakistan, Nigeria, Namibia, United States
Special Notes: Tourmaline is a crystal boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium sp that it comes in a wide variety of colors. Usually, iron-rich tourmalines are black to bluish-black to deep brown, while magnesium-rich varieties are brown to yellow, and lithium-rich tourmalines are almost any color: blue, green, red, yellow, pink, etc. Rarely, it is colorless. Bi-colored and multicolored crystals are common, reflecting variations of fluid chemistry during crystallization. Crystals may be green at one end and pink at the other, or green on the outside and pink inside; this type is called watermelon tourmaline. Tourmaline is classified as a semi-precious stone. The name comes from the Sinhalese word "Thuramali" or "Thoramalli" which applied to different gemstones found in Sri Lanka. Tourmalines piezoelectric properties make it valuable in industry. It is used in depth-sounding equipment and other equipment that measure and detect variations in pressure. It is also used in optical devices for polarizing light.
$230.00 | $255.00 |
$60.00 | $110.00 |
$500.00 |
