Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
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TITLE: Mizzonite BM1931-12 Scapolite 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:

Scapolite + muscovite + other(medium). (Norma Vergo)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: EPMA # XRF, EPMA, 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 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. G. Swayze.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1c2c3c4_ # BM1931-12 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns