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
_{For more information on the library, see:
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web link}

TITLE: Rectorite RAr-1 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: RAr-1

MINERAL_TYPE: Phyllosilicate

MINERAL: Rectorite

FORMULA: Al2Si4O10(OH)2 + (Mg,Fe+2,Al)3(Al,Si)4O10(OH)2*4H2O

FORMULA_HTML: Al₂Si₄O₁₀(OH)₂ + (Mg,Fe⁺²,Al)₃(Al,Si)₄O₁₀(OH)₂•4H₂O

COLLECTION_LOCALITY: Garland County, Arizona

ORIGINAL_DONOR: Grim Collection?

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Rectorite, a clay mineral, is a regular interstratification of a dioctahedral mica and a dioctahedral smectite.

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Rectorite + chlorite + muscovite; < 2µm cut rectorite + trace chlorite + trace muscovite M: 10-15% quartz, 2% chlorite, 2% opaque, no HCl fizz (Norma Vergo)

END_XRD_ANALYSIS.

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

COMPOSITION
KEYWORD Oxide
ASCII Amount Weight
Percent, % Oxide
html

COMPOSITION: SiO2 72.8 wt% SiO₂

COMPOSITION: TiO2 0.31 wt% TiO₂

COMPOSITION: Al2O3 16.9 wt% Al₂O₃

COMPOSITION: Fe2O3 1.22 wt% Fe₂O₃

COMPOSITION: FeO 0.38 wt% FeO

COMPOSITION: MnO less than 0.02 wt% MnO

COMPOSITION: MgO 0.26 wt% MgO

COMPOSITION: CaO 0.09 wt% CaO

COMPOSITION: Na2O 1.11 wt% Na₂O

COMPOSITION: K2O 0.45 wt% K₂O

COMPOSITION: P2O5 0.07 wt% P₂O₅

COMPOSITION: H2O+ 4.75 wt% H₂O⁺

COMPOSITION: H2O- 1.49 wt% H₂O^-

COMPOSITION: H2O 6.24 wt% H₂O

COMPOSITION: LOI 6.16 wt% LOI

COMPOSITION: Total 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	72.8	wt%	SiO₂
COMPOSITION:	TiO2	0.31	wt%	TiO₂
COMPOSITION:	Al2O3	16.9	wt%	Al₂O₃
COMPOSITION:	Fe2O3	1.22	wt%	Fe₂O₃
COMPOSITION:	FeO	0.38	wt%	FeO
COMPOSITION:	MnO	less than 0.02	wt%	MnO
COMPOSITION:	MgO	0.26	wt%	MgO
COMPOSITION:	CaO	0.09	wt%	CaO
COMPOSITION:	Na2O	1.11	wt%	Na₂O
COMPOSITION:	K2O	0.45	wt%	K₂O
COMPOSITION:	P2O5	0.07	wt%	P₂O₅
COMPOSITION:	H2O+	4.75	wt%	H₂O⁺
COMPOSITION:	H2O-	1.49	wt%	H₂O^-
COMPOSITION:	H2O	6.24	wt%	H₂O
COMPOSITION:	LOI	6.16	wt%	LOI
COMPOSITION:	Total		wt%
COMPOSITION:	O=Cl,F,S		wt%	#correction for Cl, F, S
COMPOSITION:	New Total		wt%

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

Analysts: E. Brandt, H. H. Christie

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1d2b3b4_ #RAr-1 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns