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Commonly encountered species and varieties:

Species :Tourmaline

Schorl variety: Brownish black to black
Dravite variety: also called brown tourmaline, from the Drave district of Carinthia
Achroite variety: Colorless—achroite variety (from the Greek "άχρωμος" meaning "colorless")
Dravite variety: Dark yellow to brownish black—dravite
Elbaite variety: named after the island of Elba, Italy
Verdelite variety: yellowish Green to bluish Green
Rubellite variety: Red range; Red, pinkish-red ,brownish red, orangy red, purplish red or reddish purple
Indicolite variety: violetish Blue to greenish Blue
Parti-color variety: more than one colors.
Bi-color variety: 2 colors
Watermelon variety: Watermelon, bicolor, and multicolored zoning occurs when the trace elements change in concentration or composition during a crystal’s growth. Liddicoatite can show striking and complex zoning, and gems are often fashioned to showcase exotic colorcombinations. Gemologists describe these tourmalines as parti-colored.
Chrome variety: Fine intense Green.(mush of this type is actually colored by vanadium instead of chromium): Chrome tourmaline gems offer hues that are more saturated than most green tourmalines. 
Cat’s eye variety: The most typical inclusions resemble thread-like cavities that run parallel to the length of the crystal. Under magnification, you can see that they’re filled with liquid. Growth tubes—long hollow tubes often capped with minute mineral crystals—are also common tourmaline inclusions. If they’re numerous enough, and the rough is correctly cut, they can cause a cat’s-eye.
Paraiba variety: Paraíba tourmalines appear in a range of greenish blue, bluish green, green, blue, and violet hues. This gemstone is both the most precious and valuable in the world, and with one glance, it is easy to see just why. Glowing from the inside out. Paraiba