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Alexandrite
Enstatite
Opal
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Alexandrite Catseye
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Padparasha
Silimanite Catseye
Amethyst
Fluorite
Peridot
Sinhalite
Ametrine
Garnet
Quartz
Sphene
Andalucite
Garnet Color Change
Quartz Catseye
Spinel
Apatite
Garnet Grossular
Quartz Stars
Spinel Star
Apatite Cat's Eye
Garnet Hessonite
Ruby
Star Sapphire
Aquamarine
Garnet Rhodolite
Ruby Star
Taaffeite
Aquamarine Cat's Eye
Garnet Spessartine
Rutile
Topaz
Beryl
Garnet Star
Sapphire Blue
Topaz Catseye
Chrysoberyl
Garnet Tsavorite
Sapphire Cats Eye
Tourmaline
Chrysoberyl Catseye
Iolite
Sapphire Green
Tourmaline Bi-Color
Chrysoberyl Stars
Konerupine
Sapphire Lavender
Tourmaline Col/Chg
Citrine
Kunzite
Sapphire Other
Zircon
Cobalt Spinel
Kyanite
Sapphire Pink    
Diopside
Lime Citrine
Sapphire Purple    
Diopside Cat's Eye
Moonstone
Sapphire White    
Diopside Stars
Mystic Topaz
Sapphire Yellow    
 

Tourmaline is a gemstone noted for the large and unsurpassed range of colors in which it occurs. Tourmaline may be heated to enhance it's color. The treatment is permanent and accepted in the trade, On our web site we are usually quite specific about which variety of tourmaline we are referring to. Tourmaline is the family name which includes the following varieties; chrome (green), indicolite (blue), rubelite (red), dravite (brown), achroite (colorless), and siberite (reddish-violet). Yellow and green tourmalines are simply called tourmaline with the color as a prefix.

The term "Tourmaline" has been derived from "Thoramalli" (Sinhala term). The yellowish brown tourmalines are more abundant in Sri Lanka. Tourmaline crystallizes in the hexagonal system, as prismatic Crystals with a "Rounded Triangular" cross section and vertically striated. They have vitreous lustre. Colors include Red (Rubellite), Blue (Indicolite), Yellow, Brown Green, Black colorless or party colored.


Gemological Information
Color : Blue, Bluish green, Green, Greenish blue, Green-blue or Blue-green, Greenish yellow, Orangy red, Red, Red-orange or Orange-red, Red-purple or Purple-red, slightly purplish red, slightly yellowish green, strongly purplish red, strongly yellowish green, very slightly bluish green, Yellowish green, Yellow-green or Green-yellow, Colorless, brown, Pink
Refractive Index: 1.624(+.005, -.005) - 1.644(+.006, -.006)
Chemical Composition: (NaCa)(LI,MgFe,Al)9B3Si6(O,OH)31
Hardness: 7-7.5
Density: 3.06 (.05, +.15)
Crystal Group: Hexagonal
Ocurrence: Brazil, East Africa, Nigeria, Madagascar, U.S.A.

 

 
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