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: Endellite GDS16 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS16

MINERAL_TYPE: Phyllosilicate

MINERAL: Endellite (Hydrohalloysite) (Kaolinite-Serpentine Group)

FORMULA: Al2Si2O5(OH)4*2H20

FORMULA_HTML: Al2Si2O5(OH)4•2H20

COLLECTION_LOCALITY: Joshin Mine, Tsumagoi-mura Azuma-gun, Gunma

ORIGINAL_DONOR: Grim Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

None

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

7A halloysite - no expansion with glycol. Pure. (Norma Vergo)

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Mode:
97 vol% clay
2 vol% green material (too small to identify optically)
1 vol% opaques

average grain size= less than 10 µm

Grain size too small to determine optical properties. G. Swayze.

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 1529 0.2-3.0µm 200 g.s.= less than 10 µm
LIB_SPECTRA: splib05a r 2548 0.2-3.0µm 200 g.s.=


USA.gov logo  Take Pride in America button