|
|
name:
|
Red Tourmaline
|
| gemstone variety:
|
Tourmaline
|
| trade name 1:
|
Red Tourmaline
|
| trade name 2:
|
Rubelite
|
| trade name 3:
|
Rubellite
|
| basic colour:
|
red
|
|
|
Colour :
|
a rich slightly purplish cherry-red
|
Quality :
|
the best colour is a strong, shiny cherry red. Slight
inclusions like in Rubies are accepted, because completely
flawless Red Tourmaline hardly exists. Balanced proportions
in the cut are important
|
History :
|
The name tourmaline is derived from the Singhalese
word "turamali" meaning gemstone. Rubelite is named because
of its beautiful Ruby colour.
|
Curiosities / Saga :
|
|
Countrys of Origin :
|
Brazil, Nigeria, Namibia, Tanzania, Mozambique,
Madagascar, Afghanistan, USA (California)
|
Birthstone :
|
October - Tourmaline
|
Hardness :
|
7.5
|
Treatment :
|
frequently irradiated to enhance the red colour
|
Size :
|
normally from 0.50 to 10.00 carats, possible up to
40.00 carats
|
Specific gravity :
|
3.10 - 3.26
|
Chemical Composition Formula :
|
Na(Li,Al,Fe)3 Al6 (BO3)3 Si6O18 (OH)3F
|
Chemical Composition Name :
|
Hydrous and fluor bearing sodium- lithium- aluminium-
iron- boronsilicate
|
Crystal system :
|
trigonal
|
Light refraction :
|
1.610 - 1.640
|
Double refraction :
|
0.016 - 0.022
|
|
|
