DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: SepNev-1 (1-26-87)
MINERAL_TYPE: Phyllosilicate
MINERAL: Sepiolite (Meerschaum)
FORMULA: Mg4Si6O15(OH)2*H2O
FORMULA_HTML: Mg4Si6O15(OH)2•H2O
COLLECTION_LOCALITY: Two Crows, Nevada
ORIGINAL_DONOR: Source Clay Mineral Repository
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Sepiolite is a hydrous magnesium silicate, claylike and a secondary mineral associated with serpentine.
Sample is white in color.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Spectrally pure: no dolomite
dolomite affects the continuum only; confirmed by Na-acetate buffer
purification. (Norma Vergo)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION: | SiO2 | 50.9 | wt% | SiO2 |
| COMPOSITION: | TiO2 | <0.02 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 0.45 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 0.08 | wt% | Fe2O3 |
| COMPOSITION: | FeO | <0.01 | wt% | FeO |
| COMPOSITION: | MnO | <0.02 | wt% | MnO |
| COMPOSITION: | MgO | 22.3 | wt% | MgO |
| COMPOSITION: | CaO | 2.45 | wt% | CaO |
| COMPOSITION: | Na2O | 1.12 | wt% | Na2O |
| COMPOSITION: | K2O | 0.17 | wt% | K2O |
| COMPOSITION: | P2O5 | <0.05 | wt% | P2O5 |
| COMPOSITION: | H2O+ | 10.6 | wt% | H2O+ |
| COMPOSITION: | H2O- | 8.05 | wt% | H2O- |
| COMPOSITION: | H2O | 18.6 | wt% | H2O |
| COMPOSITION: | LOI | 20.0 | wt% | LOI |
| COMPOSITION: | Total | 97.56 | wt% | |
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | 97.56 | wt% |
COMPOSITION_TRACE:
Analysis by E. Brandt, J.H. Christie, J. Taggart, Ardith J. Bartel, K. Stewart
Exists but needs to be included.
Trace analysis exists.
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 4380 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib04a r 4391 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.=