TITLE: Vermiculite VTx-1 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: VTx-1

MINERAL_TYPE: Phyllosilicate

MINERAL: Vermiculite

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

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

COLLECTION_LOCALITY: Llano, Texas

ORIGINAL_DONOR: Clay Mineral Repository

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Not vermiculite - not pure (Norma Vergo).
Spectrally pure, but not chemically pure. (Norma Vergo).

There is some confusion on whether this is a pure vermiculite.

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem

COMPOSITION: SiO2 19.5 wt% SiO2
COMPOSITION: TiO2 <0.02 wt% TiO2
COMPOSITION: Al2O3 1.53 wt% Al2O3
COMPOSITION: Fe2O3 0.56 wt% Fe2O3
COMPOSITION: MnO 0.03 wt% MnO
COMPOSITION: MgO 27.7 wt% MgO
COMPOSITION: CaO 17.7 wt% CaO
COMPOSITION: Na2O 0.26 wt% Na2O
COMPOSITION: K2O 0.03 wt% K2O
COMPOSITION: P2O5 <0.05 wt% P2O5
COMPOSITION: LOI 32.7 wt% LOI
COMPOSITION: Total wt%

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

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 5116 0.2-3.0µm 200 g.s.= <250µm
LIB_SPECTRA: splib04a r 5127 0.2-3.0µm 200 g.s.=

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

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