Name: Staurolite (Fe+2,Mg,Zn)2Al9(Si,Al)4O22(OH)2
Type: Mineral
Class: Silicate
Subclass: Nesosilicate
Particle Size: Coarse
Sample No.: staurol_1
Owner: JHU
Wavelength Range: TIR
Origin: Rubellita, Minas Gerais, Brazil via the Smithsonian (sample no.NMNH 143312)
Collection Date: N/A
Description: Sample was a large, dark brown, prismatic crystal with good faces, weighing 50.6 g. Some (10%) surface contamination with muscovite and possible quartz was removed by scraping. Small (<0.5 mm) inclusions were scattered throughout the interior of the crystal, some opaque and some not. Such inclusions are typical of this metamorphic mineral and a purer sample could not be found. Particle size was 75 - 250  Micrometers. (Framework silicates) Original ASTER Spectral Library name was jhu.nicolet.mineral.silicate.nesosilicate.coarse.stauro1.spectrum.txt
Mineral:  Staurolite (Fe+2,Mg,Zn)2Al9(Si,Al)4O22(OH)2

Sample No.:  staurol.1

XRD Analysis:  Primarily staurolite, plus mangoan almandine, plus 
others.

Chemistry:  Of 10 microprobe analyses, 9 are nominal staurolite and 
1 is ilmenite.  Average of staurolite analyses:

SiO2	27.77
Al2O3	57.61
FeO	13.14
MgO	2.11
CaO	0.01
K2O	0.01
Na2O	0.03
TiO2	0.66
Cr2O3	0.05
	_____
Total	101.39
