U.S. Geological Survey home page


Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: Meionite WS701 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: WS701

MINERAL_TYPE: Tectosilicate

MINERAL: Meionite (Scapolite group)

FORMULA: Na4Al3Si9O24(Cl,OH)/Ca4Al6Si6O24(CO3,SO4)

FORMULA_HTML: Na4Al3Si9O24(Cl,O H)/Ca4Al6Si6O24(CO3, SO4)

COLLECTION_LOCALITY: Greenville, Quebec Canada

ORIGINAL_DONOR: Ward Science Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Forms series with Marialite.

Metamorphic mineral with composition suggestive of feldspars.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Scapolite + feldspar + quartz (Norma Vergo)

END_XRD_ANALYSIS.

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


COMPOSITION
KEYWORD
Oxide
ASCII
Amount Weight
Percent, %
Oxide
html
COMPOSITION: SiO2 49.6000 wt% SiO2
COMPOSITION: TiO2 0.0420 wt% TiO2
COMPOSITION: Al2O3 25.4500 wt% Al2O3
COMPOSITION: FeO 0.0100 wt% FeO
COMPOSITION: MnO 0.0280 wt% MnO
COMPOSITION: MgO 0.0640 wt% MgO
COMPOSITION: CaO 15.4300 wt% CaO
COMPOSITION: Na2O 4.6460 wt% Na2O
COMPOSITION: K2O 0.5220 wt% K2O
COMPOSITION: Cl 0.3940 wt% Cl
COMPOSITION: F 0.0180 wt% F
COMPOSITION: SO3 2.3140 wt% SO3
COMPOSITION: CO2 0.7000 wt% CO2
COMPOSITION: Total 99.2180 wt%
COMPOSITION: O=Cl,F,S .0965 wt% #correction for Cl, F, S
COMPOSITION: New Total 99.1215 wt%

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

Average of 5 spots.

Wet chemical analysis indicates a wt% of 0.57 for C02.
(These values may be suspect because acid dissolution did not remove all CO3)

1. Mol % SiO2 includes .0160 mol % SiF4.
Mol % SiO2 includes .1880 mol % SiCl2.

2. Fe oxide in analysis is total Fe+2 + Fe+3.

3. Number of tetrahedral sites per formula set at 12.

4. Number anions per formula unit = 25.04397.
Number of oxygen equivalents per formula unit = 24.98935.

5. Cation site assignments: Standard clay-mineral default with changes.
Must occupy tetrahedral sites: Si Al
To big cation sites: Ti Fe+2 Mn Mg

XMe = 63.3 Me
XMe = Ca/(Ca+Na) = 64.7 % Me

Sample: Mizzonite

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Not done yet

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # 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 2958 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 4341 0.2-3.0µm 200 g.s.=


USA.gov logo  Take Pride in America button