SCHORL

 

TOURMALINE

 

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Tourmaline is a large family of Gemstones with more than 100 hues available.  Its name comes from the Sinhalese turmali, meaning mixed Gemstones due to the tendency to confuse Tourmalines with other Gems).Tourmaline was first introduced to the Europeans in the late 1600's or early 1700's by Dutch traders.For centuries Tourmaline adorned the jewels of royalty. The Empress Dowager Tz'u Hsi, the last empress of China, valued the rich pink colors of the Tourmaline type above all other gemstones.
     

Tourmaline is generally thought of as green, but can be almost any colour, indeed some tourmalines display two or more colours within the same crystal.Tourmaline exists in more colours than any other gemstone. The most common colour is a dark green, but bright green chrome tourmalines are seen, as are blue, red, pink, orange, yellow, colourless, brown, schorl,violet and black. Strongly coloured pink tourmaline is sometimes called rubellite.

 

TECHNICAL DETAILS

Chemical Composition and Name Complex Aluminium Borosilicate
Hardness  7.0 to 7.5
Refractive Index 1.616 - 1.634 to 1.630 - 1.652
Bi-refringence 0.014 to 0.021
Other Optical Properties Unixial
Optic Sign Negative
Specific Gravity 3.02 - 3.26
Bi-refringence 0.014 to 0.021
Cystalline System

 

Trigonal

 

 

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 Tourmaline

 Stocks)

 

SOURCES FOR THIS GEMSTONE

Burma,Sri Lanka,Vietnam,Tanzania.

 

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