Name: Spessartine Mn3Al2 (SiO4)3
Type: Mineral
Class: Silicate
Subclass: Nesosilicate
Particle Size: Solid
Sample No.: spessart_2
Owner: JHU
Wavelength Range: TIR
Origin: Rutherford #2 mine, Amelia, Amelia Co., Virginia, USA via theSmithsonian (sample no. NMNH 114143)
Collection Date: N/A
Description: The sample consisted of a group of 3 mm and smaller diameter reddish crystals.  A few clear crystals adhering to the grains were picked off and microscopic examination showed the remaining sample to be quite pure. Sample was dodecahedral crystal face.(Framework silicates); GarnetGroup Original ASTER Spectral Library name was jhu.nicolet.mineral.silicate.nesosilicate.solid.spessa2.spectrum.txt
Mineral:  Spessartine Mn3Al2 (SiO4)3

Sample No.:  spessart.2

XRD Analysis:  Pure spessartine.

Chemistry:  Microprobe analysis found one heterogeneous area 
where all oxides, including silica, summed to only 27 wt %.  
Otherwise, FeO varies from 7.5 to 12%, with inverse variation in MnO.  
Average of 10 analyses (other than anomalous point):

SiO2	35.02
Al2O3	20.74
FeO	10.40
MgO	0.04
CaO	1.61
K2O	0.03
Na2O	0.09
TiO2	0.07
MnO	30.82
Total	98.81
