Name: Tourmaline (Elbaite) Na(Li,Al)3Al6(BO3)3Si6018(OH)4
Type: Mineral
Class: Silicate
Subclass: Cyclosilicate
Particle Size: Coarse
Sample No.: tourmal_1
Owner: JHU
Wavelength Range: TIR
Origin: Sao Jose De Brejuada, Minas Gerais, Brazil via the Smithsonian(sample no.  NMNH 94217-1)
Collection Date: N/A
Description: The sample was a purple, translucent, sudhedral crystal, with some green coloration at one end. The crystal was 5 mm x 2 cm x 2 cm in size.  Microscopic examination indicated that the mineral was pure.Particle size was 75 - 250  Micrometers.(Ring Silicates) Original ASTER Spectral Library name was jhu.nicolet.mineral.silicate.cyclosilicate.coarse.tourma1.spectrum.txt
Mineral:  Tourmaline (Elbaite) Na(Li,Al)3Al6(BO3)3Si6018(OH)4

Sample No.: tourmal.1

XRD Analysis:  Pure tourmaline.

Chemistry:  Microprobe analysis showed the sample to be 
homogeneous within and between grains.  An average of 7 analyses 
does not include lithium, boron or water, but demonstrates the 
presence of sufficient manganese to indicate that this is not end 
member elbaite:

SiO2	36.83
Al2O3	40.56
FeO	0.12
MgO	0.03
CaO	0.13
K2O	0.01
Na2O	2.37
TiO2	0.04
MnO	4.40
	_____
Total	*84.49
	*Li, B, and OH not measured.
