General
- Tourmaline is a
crystal silicate mineral compounded with elements such as aluminium,
iron, magnesium, sodium, lithium, or potassium.
- 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.
- The name comes
from the Sinhalese word "turamali" or "toramalli", which applied to
different gemstones found in Ceylon.
- The tourmaline
mineral group is chemically one of the most complicated groups of
silicate minerals. Its composition varies widely because of isomorphous
replacement.
Process
-
The complex color zoning of the
polychrome tourmaline reflects a dynamic multistage crystallization
process.
-
Granitic pegmatites typically
are not rich in Ca,and any amounts present may be consumed by the early
crystallization of plagioclase and Ca-bearing tourmaline.
-
composition of gem tourmaline,
chemical data were also obtained for several samples from other
localities that are known or suspected to produce liddicoatite
Market
-
Afghanistan is blessed to have some of the most
plentiful reserves of gem and semiprecious stones in the world,
including emeralds, rubies, tourmaline, lapis lazuli, kunzite and
aquamarines.
A newly discovered deposit of
yellow and yellow-green tourmaline produced about 1,000 carats per
month.
Gemstone sales were expected to
remain stable or show a slight increase in 2002, although demand for
aquamarine and yellow tourmaline was expected to be strong.
Applications
-
Tourmaline compositions have
long been used as a useful exploration guide in several types of
economically important ore deposits.
-
Black Tourmaline is a great stone for travelers. It will help keep jet
lag and time disorientation at bay and, placed under your pillow, it
will bring restful, easy sleep.
-
leg injury that needs casting, see if your doctor will embed a piece of
Black tourmaline in the plaster to aid in healing. Its grounding energy
will also make it easier to get around while you are injured.
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