Sodium Aluminum Silicate
A variety of actinolite
|Luster||Glossy or pearly||Vitreous or silky|
|Hardness||6.5~7 (Harder than steel)||6~6.5 (Harder than steel)|
3.3 – 3.5 (Above average for translucent minerals)
|Russia, United States, South
New Zealand, Australia, Taiwan
|Class||Silicate Mineral||Silicate Mineral|
Tourmaline is a crystal boron silicate mineral
compounded with elements such as aluminium, iron, magnesium,
sodium, lithium, or potassium. The tourmaline mineral group is
chemically one of the most complicated groups of silicate minerals.
Its composition varies widely because of isomorphous
replacement. Gem and specimen tourmaline is mined chiefly in
Brazil and Africa. Some placer material suitable for gem use comes
from Sri Lanka. In addition to Brazil, tourmaline is mined in
Tanzania, Nigeria, Kenya, Madagascar, Mozambique, Namibia,
Afghanistan, Pakistan, Sri Lanka, and Malawi.
Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors. It has a refractive index of around 1.61 to 1.67 and a specific gravity of 3.06. Tourmaline has a 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.
Tourmanium Ceramic stones are made out of tourmaline, germanium
volcanic rocks and elan rocks by powdering & baking them at
very high temperatures. These stones are further used in
therapy devices like tourmanium ceramic heating mats.
WHY WE USE JADE/TOURMANIUM STONE IN THERAPEUTIC MASSAGERS ?