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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Mizzonite HS351 Scapolite DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS351
MINERAL_TYPE: Tectosilicate
MINERAL: Mizzonite (Scapolite group)
FORMULA: Na4Al3Si9O24(Cl,OH)/Ca4Al6Si6O24(CO3,SO4)
FORMULA_HTML: Na4Al3Si9O24(Cl,O H)/Ca4Al6Si6O24(CO3, SO4)
COLLECTION_LOCALITY: Quebec, Canada
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
This mineral occurs in metamorphosed limestone's around intrusive igneous rocks, and also in calcium-rich schists and gneisses. This sample displays weak water bands and a strong CO3 band near 2.35µ.
Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and near-infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geology, v. 4, p. 85-106.
Sample description, NIR, MID-IR spectra and analysis published in:
Swayze,G.A., and R.N. Clark, 1990, Infrared Spectra and Crystal Chemistry of Scapolites: Implications for Martian Mineralogy. J. Geophys Res. v. 95, pp. 14481-14495. Apparently the sample has a trace of prehnite.
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Scapolite + large amount other; M: ~2% pyrrhotite; slight HCl fizz. Spectrally pure: no calcite bands. (Norma Vergo)
Sample was subsequently purified with heavy liquid separation and "large amount other" was found to be plagioclase. Present spectrum was run on hand-picked grains. G. Swayze. Apparently some of these grains were prehnite.
Meionite(Major),Augite (major),calcite,quartz,microcline,weddellite,albite (traces). Sutley, April 2005.:wq XRD shows evidence for a trace of prehnite.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 48.55 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.14 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 25.59 | wt% | Al2O3 |
| COMPOSITION: | FeO | 0.0 | wt% | FeO |
| COMPOSITION: | MnO | 0.0 | wt% | MnO |
| COMPOSITION: | MgO | 0.05 | wt% | MgO |
| COMPOSITION: | CaO | 16.35 | wt% | CaO |
| COMPOSITION: | Na2O | 4.59 | wt% | Na2O |
| COMPOSITION: | K2O | 0.48 | wt% | K2O |
| COMPOSITION: | Cl | 0.09 | wt% | Cl |
| COMPOSITION: | F | 0.41 | wt% | F |
| COMPOSITION: | SO3 | 1.89 | wt% | SO3 |
| COMPOSITION: | CO2 | 2.82 | wt% | CO2 |
| COMPOSITION: | Total | 100.96 | wt% | |
| COMPOSITION: | O=Cl,F,S | 0.13 | wt% | #correction for Cl, F, S |
| COMPOSITION: | New Total | 100.82 | wt% |
COMPOSITION_TRACE: Exists but is not included.
COMPOSITION_DISCUSSION:
%Me= 65 End member: Mizzonite.
present spectrum was run on hand-picked grains, some of which were
prehnite grains. BS on end of
catalogue no. indicates that this sample was hand-separated. G. Swayze.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Sample still has some prehnite contamination.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
Sample probably contains prehnite which does contribute some strong spectral features between 2.3 and 2.45 microns. This phase may be hard to differentiate from scapolite with x-ray diffraction analysis.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2c3d4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
| LIB_SPECTRA_HED: | where | Wave Range | Av_Rs_Pwr | Comment |
|---|---|---|---|---|
| LIB_SPECTRA: | splib04a r 3088 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 4461 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 14141 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 14155 | g.s.= |