Name: Olivine (Fo11) (Fe+2,Mg)2SiO4
Type: Mineral
Class: Silicate
Subclass: Nesosilicate
Particle Size: Fine
Sample No.: olivine_10
Owner: JHU
Wavelength Range: TIR
Origin: Twin Sisters Peak, Washington via Trude King #TSD
Collection Date: N/A
Description: Olivine from the Twin Sisters intrusive was optically examined using a petrographic icroscope prior to spectral measurements to insure purity of the olivine.  The sample was >98% pure olivine.  It was hand ground and wet sieved into <60 m size range.  Sample preparation was by Trude King, USGS, Denver. Particle size was Less than 2  Micrometers.(Isolated tetrahedra); (Olivine Group) Original ASTER Spectral Library name was jhu.nicolet.mineral.silicate.nesosilicate.powder.olivi10.spectrum.txt
Mineral:  Olivine (Fo91) (Fe+2,Mg)2SiO4

Sample No.: olivine.10

XRD Analysis:  None.

Chemistry:  Microprobe analysis by W.I. Ridley, USGS, showed good 
Fo91 composition:

SiO2	40.60
TiO2	0.14
Al2O3	0.05
Cr2O3	0.06
MnO	0.12
NiO	0.28
FeO 	7.93
MgO 	50.70
CaO	0.06
	_____
Total	99.94
