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: Margarite GDS106 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS106

MINERAL_TYPE: Phyllosilicate

MINERAL: Margarite (Mica group)

FORMULA: CaAl2(Al2Si2)O10(OH)2

FORMULA_HTML: CaAl₂(Al₂Si₂)O₁₀(OH)₂

COLLECTION_LOCALITY: Chester, MA

ORIGINAL_DONOR: Jim Crowley, USGS Reston

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 6.5-9.5 keV

References: JCPDS #18-276; Huebner's patterns for margarite and chlorite; "ripidolite" GDS157

Found: Margarite and chlorite in subequal proportions Comment: Both phases have sharp reflections indicating good crystallinity and compositional homogeneity. (Jim Crowley, 1993, written communication.)

END_XRD_ANALYSIS.

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

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Possible chlorite absorptions in the 2.3 micron region with a broad absorption from 0.5 to 2.0 microns.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1c2_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 2905	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib05a r 4278	0.2-3.0µm	200	g.s.=

AccessibilityFOIAPrivacyPolicies and Notices
U.S. Department of the Interior | U.S. Geological Survey URL: https://pubsdata.usgs.gov/pubs/of/2003/ofr-03-395/DESCRIPT/M/margarite_gds106.html Questions or Assistance: USGS Web Contact Page Last Modified: Sat Jan 12 23:32 EST 2013