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TITLE: Prehnite+Muscovite BM1931,12 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: BM1931,12
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: Grenville, Argenteuil County, Quebec, Canada
ORIGINAL_DONOR: British Museum of Natural History
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Scapolites are metamorphic minerals with compositions suggestive of feldspars. There is a complete solid solution series between marialite and meionite.
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.
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
From the 1980s-early 1990s:
Scapolite + muscovite + other(m). (Norma Vergo)
Note that spectrum does not show effect of muscovite. "Other" may be
plagioclase. This spectrum closely resembles that of cleaned sample
run on a Nicolet FTIR spectrometer. Therefore the features
presented here are due to those of the scapolite. G. Swayze.
Once we understood the 2.35-micron features were due to phrenite and not muscovite, the presence of muscovite bands is also understood. Newer XRD shows phrenite and miscovite.
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 | 44.84 | wt% | SiO2 |
COMPOSITION: | TiO2 | 0.0 | wt% | TiO2 |
COMPOSITION: | Al2O3 | 28.77 | wt% | Al2O3 |
COMPOSITION: | FeO | 0.01 | wt% | FeO |
COMPOSITION: | MnO | 0.0 | wt% | MnO |
COMPOSITION: | MgO | 0.0 | wt% | MgO |
COMPOSITION: | CaO | 19.74 | wt% | CaO |
COMPOSITION: | Na2O | 2.57 | wt% | Na2O |
COMPOSITION: | K2O | 0.33 | wt% | K2O |
COMPOSITION: | Cl | 0.02 | wt% | Cl |
COMPOSITION: | F | 0.0 | wt% | F |
COMPOSITION: | SO3 | 0.9 | wt% | SO3 |
COMPOSITION: | CO2 | 3.43 | wt% | CO2 |
COMPOSITION: | Total | 100.64 | wt% | |
COMPOSITION: | O=Cl,F,S | 0.004 | wt% | #correction for Cl, F, S |
COMPOSITION: | New Total | 100.636 | wt% |
COMPOSITION_TRACE: Exists but is not included.
COMPOSITION_DISCUSSION:
%Me = 80. End-Member: Mizzonite.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
Sample probably contains prehnite which may contribute some strong spectral features. This phase may be hard to differentiate from scapolite with x-ray diffraction analysis.Sample: Command not found. spectral features. This phase may be hard to differentiate from scapolite with x-ray diffraction analysis.spectral: Command not found. scapolite with x-ray diffraction analysis.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2c3c4_ # 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 3064 | 0.2-3.0µm | 200 | g.s.= |
LIB_SPECTRA: | splib05a r 4435 | 0.2-3.0µm | 200 | g.s.= |
LIB_SPECTRA: | splib06a r 14023 | g.s.= | ||
LIB_SPECTRA: | splib06a r 14037 | g.s.= |