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: Roscoelite EN124 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: EN124

MINERAL_TYPE: Phyllosilicate

MINERAL: Roscoelite (vanadium mica) (Mica group)

FORMULA: KV2(AlSi3O10)(OH)2

FORMULA_HTML: KV₂(AlSi₃O₁₀)(OH)₂

COLLECTION_LOCALITY: Carpenter Mine, along Bear Creek in SW Colorado, Sec 33 T43N R10W, Long 107 58' 45" Lat 37 56' 40" 600 feet from the portal of the Carpenter Mine

ORIGINAL_DONOR: George Breit

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Less than 2 µm clay separate prepared from a sample of V-U ore from the Late Jurassic Entrada Sandstone.

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Illite and illite-smectite with < 15% smectite interlayers. No other minerals were detected (personal communication from G. Breit, 1990)

END_XRD_ANALYSIS.

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

COMPOSITION
KEYWORD Oxide
ASCII Amount Weight
Percent, % Oxide
html

COMPOSITION: TiO2 0.12 wt% TiO₂

COMPOSITION: Al2O3 27.2 wt% Al₂O₃

COMPOSITION: Cr2O3 less than 0.02 wt% Cr₂O₃

COMPOSITION: V2O3 10.0 wt% V₂O₃

COMPOSITION: Fe2O3 *0.66 wt% Fe₂O₃

COMPOSITION: MnO 0.01 wt% MnO

COMPOSITION: MgO 0.64 wt% MgO

COMPOSITION: Na2O 0.04 wt% Na₂O

COMPOSITION: K2O 9.07 wt% K₂O

COMPOSITION: Total 47.76 wt%

COMPOSITION KEYWORD	Oxide ASCII	Amount	Weight Percent, %	Oxide html
COMPOSITION:	TiO2	0.12	wt%	TiO₂
COMPOSITION:	Al2O3	27.2	wt%	Al₂O₃
COMPOSITION:	Cr2O3	less than 0.02	wt%	Cr₂O₃
COMPOSITION:	V2O3	10.0	wt%	V₂O₃
COMPOSITION:	Fe2O3	*0.66	wt%	Fe₂O₃
COMPOSITION:	MnO	0.01	wt%	MnO
COMPOSITION:	MgO	0.64	wt%	MgO
COMPOSITION:	Na2O	0.04	wt%	Na₂O
COMPOSITION:	K2O	9.07	wt%	K₂O
COMPOSITION:	Total	47.76	wt%

COMPOSITION_TRACE: Ca < 20 ppm

COMPOSITION_DISCUSSION:

* All Fe reported given as total Fe wt% (includes both FeO and Fe₂O₃.

Done by George Breit.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # EN124 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns