Elbaite

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Cyclosilicate

Sample ID

NMNH94217-1.a, NMNH94217-1.b, NMNH94217-1.c

Collection Locality

Sao Jose De Brejuada, Minas Gerais, Brazil

Spectral Purity

1b2b3b4b # Elbaite NMNH94217-1.a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2b3b4b # Elbaite NMNH94217-1.b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # Elbaite NMNH94217-1.c # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

EPMA # XRF, EPMA, ICP(Trace), WChem COMPOSITION KEYWORD Oxide ASCII Amount Weight Percent, % Oxide html COMPOSITION: SiO2 36.83 wt% SiO2 COMPOSITION: TiO2 0.04 wt% TiO2 COMPOSITION: Al2O3 40.56 wt% Al2O3 COMPOSITION: FeO 0.12 wt% FeO COMPOSITION: MnO 4.40 wt% MnO COMPOSITION: MgO 0.03 wt% MgO COMPOSITION: CaO 0.13 wt% CaO COMPOSITION: Na2O 2.37 wt% Na2O COMPOSITION: K2O 0.01 wt% K2O COMPOSITION: Total 84.49 wt% COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S COMPOSITION: New Total wt%

Sample Description

Forms series with Dravite. "Results of petrographic examination: A purple sudhedral crystal, transparent with some green coloration to one end. Sample is ~5mm x 2cm x 2cm. Under petrographic microscope, sample appears pure, clear." Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263. Sample is in the following sieve intervals: (a) 250µm, (b) 150µm, (c) less than 74µm IMAGE_OF_SAMPLE:

XRD Analysis

Elbaite plus many peaks (Norma Vergo).

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126