17.76 CTS TOURMALINE BLACK /GREEN GOLD. SPECIMEN [F4778]

Item Information

Dimensions (mm) not provided
Weight (carats) not provided
Colors
Certified Gemstone

QUALITY ROUGH

SPECIMEN

TOURMALINE BLACK GREEN GOLD

This is a specimen of natural untreated rough black tourmaline crystals with some interesting  green gold colour .This isnt faceting material but suitable for cabs or specimens.

Mohs scale  7-7.5

Weight 17.76 cts app

Size  21 x 10 x 9 mm

 Mined in Brazil

Photo has been taken with the stone wet.

 


 

 

 

Tourmaline is a crystal silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline gem stones come in a wide variety of colors.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. Rarely, it is colorless. Bi-colored and multicolored crystals are common, reflecting variations of fluid chemistry during crystallisation. Crystals may be green at one end and pink at the other, or green on the outside and pink inside: this type is called watermelon tourmaline. Some forms of tourmaline are dichroic, in that they change color when viewed from different directions.


1d 3h 10m 48s

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Pricing & Details

Bid Increment $1.00
Starting Bid $30.00
Auction ID 411595
Watchers 4 watching
Viewed 368 times
Starts 19th Jan 2018 4:05pm PST
Ends 21st Jan 2018 4:05pm PST

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