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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TITLE: Lizardite NMNHR4687 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: NMNHR4687.a, NMNHR4687.b, NMNHR4687.c, NMNHR4687.d

MINERAL_TYPE: Phyllosilicate

MINERAL: Lizardite (Kaolinite-Serpentine group)

FORMULA: Mg3Si2O5(OH)4

FORMULA_HTML: Mg₃Si₂O₅(OH)₄

COLLECTION_LOCALITY: Tyrol, Austria

ORIGINAL_DONOR: Smithsonian

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Forms series with Neupouite. Polymorphous with Antigorite, Clinochrysotile, Orthochrysotile, and Parachrysotile.

The sample was ground in an alumina mortar and pestle and wet sieved using methanol.

Grain size fractions are indicated by the extension after the sample number:
.d = <30µm
.c = 60-104µm
.b = 150-250µm
.a = >250µm

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS: This is a pure lizardite. Sample analysis by Norma Vergo.

Clark, R.N., T.V.V. King, M. Klejwa, G. Swayze, and N. Vergo, 1990, High spectral resolution reflectance spectroscopy of minerals: J. Geophys Res. 12653-12680.

END_XRD_ANALYSIS.

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

COMPOSITION
KEYWORD Oxide
ASCII Amount Weight
Percent, % Oxide
html

COMPOSITION: SiO2 40.97 wt% SiO₂

COMPOSITION: Fe2O3 5.55 wt% Fe₂O₃

COMPOSITION: MgO 40.43 wt% MgO

COMPOSITION: H2O 13.80 wt% H₂O

COMPOSITION: Total 100.75 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	40.97	wt%	SiO₂
COMPOSITION:	Fe2O3	5.55	wt%	Fe₂O₃
COMPOSITION:	MgO	40.43	wt%	MgO
COMPOSITION:	H2O	13.80	wt%	H₂O
COMPOSITION:	Total	100.75	wt%
COMPOSITION:	O=Cl,F,S		wt%	#correction for Cl, F, S
COMPOSITION:	New Total		wt%

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

This is an isochemical end member Mg-rich serpentine. Compositional data provided by Branch of Geochemistry, USGS, Denver.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Microscopically this is a pure lizardite.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # NMNHR4687.a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # NMNHR4687.b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # NMNHR4687.c # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2c3b4_ # NMNHR4687.d # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns