Name: Biotite K(Mg,Fe+2)3(Al,Fe+3)Si3O10(OH,F)2
Type: Mineral
Class: Silicate
Subclass: Phyllosilicate
Particle Size: Coarse
Sample No.: biotite_2
Owner: JHU
Wavelength Range: TIR
Origin: Hunt and Salisbury Collection #28B (purchased from Ward'sNatural Science Establishment).; Sample from Ontario, Canada. 
Collection Date: N/A
Description: No solid sample was available.  The particulate samples appeared to be pure brown biotite showing neither inclusions nor impurities under the microscope. Particle size was 74-250 Micrometers.(Mica Group) Original ASTER Spectral Library name was jhu.nicolet.mineral.silicate.phyllosilicate.coarse.biotit2.spectrum.txt
Mineral:  Biotite K(Mg,Fe+2)3(Al,Fe+3)Si3O10(OH,F)2

Sample No.: biotite.2

XRD Analysis:  Sample is biotite plus very weak peaks due to another 
component at 9.3 and 5.98 angstroms.

Chemistry:  Microprobe analysis shows average biotite composition.  
Average of six analyses:

SiO2	38.80
Al2O3	11.50
FeO	17.63
MgO	13.54
CaO	0.03
K2O	8.60
Na2O	0.59
TiO2 	2.14
Cr2O3	0.06
	_____
Total	*92.89
*OH and F not measured
