Green Tourmaline
The tourmaline is a unique miracle of colour. The gemstone comes in green, red, blue, yellow, but there are also colourless specimens and black ones. Often two or more colours are found in a single tourmaline crystal.
Green tourmaline should not be confused with emerald, or red tourmaline with ruby. It has a wide distribution and is especially diffuse in Brazil and Madagascar.
Name
Moh's ...
Chrome Green Tourmaline
By Richard W. Wise
Excerpts from the book: Secrets of the gem trade (the connoisseur's guide to precious gemstones) ...
Calibrated Green Tourmaline
Specify size, shape and quality when ordering. Prices are subject to change without notice. Actual carat weight may vary from the average carat weight listed.
Green Tourmaline (Verdelite)
Green tourmaline is believed to be a healer on all level. It is used to purify and strengthen the nervous system so that it can circulate increased spiritual energy.
Green tourmaline
Typically free from inclusions, green tourmaline offers gem consumers everything they want in an emerald, but with more clarity.
Green Tourmaline - It is gaining popularity at the rapid pace. Fortunately with good supply it is sort of affordable. As pink gem suits females, green is for males as it endorses male stability and safety.
green tourmaline
One particularly popular variety is the green Tourmaline, known as 'verdelite' in the trade. In good qualities, these gemstones are much sought-after treasures today.
Colors, names and nicknames ...
Green tourmalines of the best hue actually resemble emeralds, and are widely used as a kind of emerald stimulant. In the sixteenth century green tourmalines from Brazil were thought to be emerald.
From green tourmaline by lack of dichroism, R.I.
From green zircon by R.I., lower birefringence, and S.G.
From emerald by color (more yellow in peridot) and inclusions, R.I.
From green glass with polariscope.
Fine green tourmalines can run close to a thousand dollars a carat, but are more often closer to about half that price. Because they often show an excellent green color, they are a good substitute for more expensive emeralds or tsavorites.
Blue and green tourmaline People can suffer from two types of chaos: chaos ‘inside the head' and chaos ‘outside' (in the environment and daily life). These different types of chaotic people may benefit from blue or green tourmaline.
Pink and mint green tourmaline, however, is widely available and more affordable, with prices in the hundreds of dollars per carat. The Empress Dowager Tz'u Hsi, the last empress of China, loved pink tourmaline above all other gemstones.
[Heated blue and green tourmalines, lightened enough to be attractive, a red tourmaline that might possibly have been heated] ...
A rare mineral, Cookeite, which is stated by Dana (Manual of Mineralogy, p. 314) to be an alteration product of rubellite, is found enveloping the green tourmaline; ...
Other green gemstones confused with peridot are apatite (which is much softer), green garnets and moldavites (which have no double refraction), green tourmaline and green sinhalite (both of which are strongly pleochroic), ...
Tourmalines, when green, are usually darker than emeralds and of a more pronounced yellow green, or they may be of too bluish a green, as is the case with some of the finest of the green tourmalines from Maine.
Fall 1965, Intense emerald-green tourmaline, p. 340, 2pp.
Summer 1966, A fine blue-green tourmaline from Mount Mica, Me., p. 43, 2pp. (See also Fall 1966, p. 70, 2pp.)
Winter 1967, Chrome tourmaline of Tanzania, p. 242, 3pp.
Again there are green emerald-like colors of Tourmaline, called Green Tourmaline. Paraiba is another variation of Tourmaline that possesses a bright greenish blue color. Canary Tourmaline again, refers to the yellowish Tourmaline.
These gems do not look the like the somewhat ugly green tourmaline from Brazil. The reason is due to the fact they possess chromium. In its top colors, chromes resemble gem tsavorite (See Tsavorite).
Dark blue, blue-green, and green tourmalines are occasionally heated to lighten their color. Red tourmalines, also known as rubellites, and pink varieties are sometimes heated or irradiated to improve their colors.
Greens - there are two distinct families of green tourmaline, one contains trace amounts of chromium (and coincidentally is called Chrome Tourmaline). It has a high value.
USGS 1906 King mine Pink and Green Tourmaline production overview.
USGS 1907 has a lot: Pink, Green Pala Tourmaline and a new Tourmaline pocket
USGS 1912: Description of purchase Morgan/American Museum Pink Tourmaline pieces at end of chapter ...
natural and artificial light are known as rubelites; red tourmalines that turn pink when the light changes are called a pink tourmalines; blue tourmalines are known as indicolites; yellowish brown tourmalines are known as dravites; green tourmalines ...
An other mineral inclusion occurs in the variety called tourmalinated quartz, this instead of golden rutile, has black or dark green tourmaline crystals.
This was called in French "flèches d'amour" or Cupid's darts.
Tourmalinated quartz is a variety of transparent quartz that has needle-like inclusions of black to dark green tourmaline crystals. This beautiful stone is found worldwide. Tourmalinated quartz has a hardness of 7.0. This stone is not enhanced.
Labels are important to your collection. They are the only evidence to distinguish an ordinary green tourmaline from Brazil from that rare tourmaline from the Gillette Quarry in Connecticut.
Optics -- R.I. 1.63-1.64, varying with the composition. Prominent pleochroism and pencil-shaped crystal often dictate cutting green tourmaline in long step cuts with steep pavilion ends to minimize black C axis effect.
It is not affected by changes of light, as is a sapphire. Other, inferior, stones that are similar in appearance are green corundum, green tourmaline, demantoid, diopside, chrysolite, and hiddenite.
Emeralds in ancient times ...
" Opinions in the gem trade vary on the fine line between "indicolite" and the considerably more common blue-green tourmaline, but blue-green can be one of tourmaline's most beautiful colors so it is still highly valued.
The green color varies depending on the percentage of iron content, more than 15 percent gives an overall dark "blackish green" color which is unsuitable for it to be classified as gemstones. Peridot may be confused with green Tourmaline, ...
blue-green to light blue to deep blue, and as colorless crystals. The State's mines also produce bicolors and watermelon crystals. The colors can be very fine and some believe that Maine tourmalines set the standard for non-chrome green tourmaline.
Each pattern is different and some are breathtakingly beautiful. The inclusions are sometimes called Venus hair. Less well known is a variety called tourmalinated quartz which, instead of golden rutile, has black or dark green tourmaline crystals.
 See also: Tourmaline, Stone, Color, Crystal, Gemstone
  
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