TITLE: Lizardite NMNHR4687 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: NMNHR4687

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 into <30µm (d), 60-104µm (c), 150-250µm (b) and >250µm (a) size fractions. The letter denotes spectrum designation.

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, EM(WDS), ICP(Trace), WChem


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: 1_2_3_4_

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment

LIB_SPECTRA: splib04a r 2799 0.2-2.7µm 200 g.s.=280µm
LIB_SPECTRA: splib04a r 2809 0.2-2.7µm 200 g.s.=165µm
LIB_SPECTRA: splib04a r 2820 0.2-2.7µm 200 g.s.=70µm
LIB_SPECTRA: splib04a r 2831 0.2-2.7µm 200 g.s.=15µm

LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=