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: Sepiolite SepNev-1 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: SepNev-1 (1-26-87)

MINERAL_TYPE: Phyllosilicate

MINERAL: Sepiolite (Meerschaum)

FORMULA: Mg4Si6O15(OH)2*H2O

FORMULA_HTML: Mg₄Si₆O₁₅(OH)₂•H₂O

COLLECTION_LOCALITY: Two Crows, Nevada

ORIGINAL_DONOR: Source Clay Mineral Repository

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Sepiolite is a hydrous magnesium silicate, claylike and a secondary mineral associated with serpentine.

Sample is white in color.

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Sepiolite and some dolomite. (N. Vergo).

END_XRD_ANALYSIS.

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

COMPOSITION
KEYWORD Oxide
ASCII Amount Weight
Percent, % Oxide
html

COMPOSITION: SiO2 50.9 wt% SiO₂

COMPOSITION: TiO2 less than 0.02 wt% TiO₂

COMPOSITION: Al2O3 0.45 wt% Al₂O₃

COMPOSITION: Fe2O3 0.08 wt% Fe₂O₃

COMPOSITION: FeO less than 0.01 wt% FeO

COMPOSITION: MnO less than 0.02 wt% MnO

COMPOSITION: MgO 22.3 wt% MgO

COMPOSITION: CaO 2.45 wt% CaO

COMPOSITION: Na2O 1.12 wt% Na₂O

COMPOSITION: K2O 0.17 wt% K₂O

COMPOSITION: P2O5 less than 0.05 wt% P₂O₅

COMPOSITION: H2O+ 10.6 wt% H₂O⁺

COMPOSITION: H2O- 8.05 wt% H₂O^-

COMPOSITION: H2O 18.6 wt% H₂O

COMPOSITION: LOI 20.0 wt% LOI

COMPOSITION: Total 97.56 wt%

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

COMPOSITION: New Total 97.56 wt%

COMPOSITION KEYWORD	Oxide ASCII	Amount	Weight Percent, %	Oxide html
COMPOSITION:	SiO2	50.9	wt%	SiO₂
COMPOSITION:	TiO2	less than 0.02	wt%	TiO₂
COMPOSITION:	Al2O3	0.45	wt%	Al₂O₃
COMPOSITION:	Fe2O3	0.08	wt%	Fe₂O₃
COMPOSITION:	FeO	less than 0.01	wt%	FeO
COMPOSITION:	MnO	less than 0.02	wt%	MnO
COMPOSITION:	MgO	22.3	wt%	MgO
COMPOSITION:	CaO	2.45	wt%	CaO
COMPOSITION:	Na2O	1.12	wt%	Na₂O
COMPOSITION:	K2O	0.17	wt%	K₂O
COMPOSITION:	P2O5	less than 0.05	wt%	P₂O₅
COMPOSITION:	H2O+	10.6	wt%	H₂O⁺
COMPOSITION:	H2O-	8.05	wt%	H₂O^-
COMPOSITION:	H2O	18.6	wt%	H₂O
COMPOSITION:	LOI	20.0	wt%	LOI
COMPOSITION:	Total	97.56	wt%
COMPOSITION:	O=Cl,F,S		wt%	#correction for Cl, F, S
COMPOSITION:	New Total	97.56	wt%

COMPOSITION_TRACE:

Analysis by E. Brandt, J.H. Christie, J. Taggart, Ardith J. Bartel, K. Stewart

Exists but needs to be included.

Trace analysis exists.

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Dolomite affects the continuum only; confirmed by Na-acetate buffer purification.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2b3b4u # SepNev-1 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns