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: Clinochlore GDS159 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS159

MINERAL_TYPE: Phyllosilicate

MINERAL: Clinochlore, Chlorite

FORMULA: (Mg,Fe2+)5Al((Si3Al)O10(OH)8

FORMULA_HTML: (Mg,Fe2+)5Al(Si3Al)O10(OH)8

COLLECTION_LOCALITY: Frisco Mine, California? ORIGINAL_DONOR: Jim Post CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory. ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory. SAMPLE_DESCRIPTION:

Clinochlore was previously called Sheridanite.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS: 40 kV - 30 mA, 6.5-9.5 keV (sheridan.out=sherd9.out) Reference: JCPDS #12-242 Found: Chlorite type IIb; weak but sharp reflection at 9.3 degrees 2 theta; (mica?); weak reflection at 3.13 angstroms (albite?) Sought but not found: quartz Comments: An excellent chlorite pattern; sharp reflections indicate good crystallinity. The chemical analysis is that of a clinochlore. J.S. Huebner, J. Pickrell, and T. Schaefer, 1994, written communication. 40 kV - 30 mA, 6.5-9.5 keV File: sherd159.out, -.mdi (smear mount on quartz plate) References: Bailey (1988 in Clays and Clay Minerals 36, 193-213); JCPDS #25-177, 35-731, 21-1276; Huebner's reference patterns Found: Clinoclore type IIbb, weak reflection at 9.4 angstroms (mica?), 3.24 angstroms (sphene(?), 3.12 angstroms (La-monazite?) Comment: Very sharp reflections indicate high degree of crystallinity and compositional homogeneity. Position of (060) reflection consistent with Mg/(Mg+Fe+Mn) = 1.00. Optically, about modeal 1% "heavy" minerals (huge index and birefringence). Rutile has its strongest reflection at 3.24 angstroms but was not found optically (compare with GDS-158, "rutilated clinochlore").

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem


COMPOSITION
KEYWORD
Oxide
ASCII
Amount Weight
Percent, %
Oxide
html
COMPOSITION: SiO2 31.3 wt% SiO2
COMPOSITION: TiO2 0.20 wt% TiO2
COMPOSITION: Al2O3 19.4 wt% Al2O3
COMPOSITION: Cr2O3 0.004 wt% Cr2O3
COMPOSITION: Fe2O3 1.16 wt% Fe2O3
COMPOSITION: MnO 0.02 wt% MnO
COMPOSITION: MgO 34.7 wt% MgO
COMPOSITION: CaO 0.04 wt% CaO
COMPOSITION: Na2O 0.20 wt% Na2O
COMPOSITION: K2O 0.01 wt% K2O
COMPOSITION: P2O5 0.01 wt% P2O5
COMPOSITION: LOI13.3 wt% LOI
COMPOSITION: Total 100.344 wt%
COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S
COMPOSITION: New Total wt%
COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

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 1099 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 1911 0.2-3.0µm 200 g.s.=


USA.gov logo  Take Pride in America button