Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
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TITLE: Chlorite SMR-13 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: SMR-13.a, SMR-13.b, SMR-13.c, SMR-13.d, SMR-13.e

MINERAL_TYPE: Phyllosilicate

MINERAL: Chlorite Mg-rich (Chlorite group)

FORMULA: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6

FORMULA_HTML: (Mg,Fe)₃(Si,Al)₄O₁₀(OH)₂-(Mg,Fe)₃(OH)₆

COLLECTION_LOCALITY: Not available

ORIGINAL_DONOR: Gene Whitney, USGS Denver

CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.

ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.

SAMPLE_DESCRIPTION:

Sample was ground in an alumina mortar and pestle and wet sieved with methanol into less than 30µm (e), 30-45µm (d), 45-60µm (c), 60-104µm (b), and 104-150µm (a) size fractions. (Letter denotes spectrum designation)

King, T.V.V. and R.N. Clark, 1989, Spectral Characteristics of Chlorites and Mg-Serpentines Using high-Resolution Reflectance Spectroscopy. Jour. Geophys. Res., 13.997-14,008.

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Sample was analyzed and found to be a Mg-rich chlorite. (King and Clark, 1989)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: EPMA # XRF, EPMA, ICP(Trace), WChem

COMPOSITION
KEYWORD Oxide
ASCII Amount Weight
Percent, % Oxide
html

COMPOSITION: SiO2 31.00 wt% SiO₂

COMPOSITION: TiO2 0.08 wt% TiO₂

COMPOSITION: Al2O3 17.30 wt% Al₂O₃

COMPOSITION: Fe2O3 8.34 wt% Fe₂O₃

COMPOSITION: MnO 0.12 wt% MnO

COMPOSITION: MgO 30.20 wt% MgO

COMPOSITION: CaO 0.02 wt% CaO

COMPOSITION: Na2O 0.23 wt% Na₂O

COMPOSITION: K2O less than 0.02 wt% K₂O

COMPOSITION: P2O5 less than 0.05 wt% P₂O₅

COMPOSITION: LOI 12.30 wt% LOI

COMPOSITION: Total 99.66 wt%

COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S

COMPOSITION: New Total wt%

COMPOSITION KEYWORD	Oxide ASCII	Amount	Weight Percent, %	Oxide html
COMPOSITION:	SiO2	31.00	wt%	SiO₂
COMPOSITION:	TiO2	0.08	wt%	TiO₂
COMPOSITION:	Al2O3	17.30	wt%	Al₂O₃
COMPOSITION:	Fe2O3	8.34	wt%	Fe₂O₃
COMPOSITION:	MnO	0.12	wt%	MnO
COMPOSITION:	MgO	30.20	wt%	MgO
COMPOSITION:	CaO	0.02	wt%	CaO
COMPOSITION:	Na2O	0.23	wt%	Na₂O
COMPOSITION:	K2O	less than 0.02	wt%	K₂O
COMPOSITION:	P2O5	less than 0.05	wt%	P₂O₅
COMPOSITION:	LOI	12.30	wt%	LOI
COMPOSITION:	Total	99.66	wt%
COMPOSITION:	O=Cl,F,S		wt%	#correction for Cl, F, S
COMPOSITION:	New Total		wt%

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

Compositional data provided by Gene Whitney. King, T.V.V. and R.N. Clark, 1989, Spectral Characteristics of Chlorites and Mg-Serpentines Using high-Resolution Reflectance Spectroscopy. Jour. Geophys. Res., 13.997-14,008.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Microscopically this appears to be a pure chlorite sample. All size fractions were examined visually and by energy dispersive methods to insure chemical homogeneity as a function of grain size interval. Plates about 10 µm thick. G.Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2a3a4_ # SMR-13.a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # SMR-13.b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # SMR-13.c # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # SMR-13.d # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2b3b4_ # SMR-13.e # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns