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

avg gr sz = < 10 µm

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

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1_2_3_4_

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment

LIB_SPECTRA: splib04a r 1529 0.2-3.0µm 200 g.s.= < 10 µm

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

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=