TITLE: Roscoelite EN124 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: EN124

MINERAL_TYPE: Phyllosilicate

MINERAL: Roscoelite (vanadium mica) (Mica group)

FORMULA: KV2(AlSi3O10)(OH)2

FORMULA_HTML: KV2(AlSi3O10)(OH)2

COLLECTION_LOCALITY: Carpenter Mine, along Bear Creek in SW Colorado, Sec 33 T43N R10W, Long 107 58' 45" Lat 37 56' 40" 600 feet from the portal of the Carpenter Mine

ORIGINAL_DONOR: George Breit

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Less than 2 µm clay seperate prepared from a sample of V-U ore from the Late Jurassic Entrada Sandstone.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Illite and illite-smectite with < 15% smectite interlayers. No other minerals were detected (personal communication from G. Breit, 1990)

END_XRD_ANALYSIS.

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

COMPOSITION: TiO2 0.12 wt% TiO2
COMPOSITION: Al2O3 27.2 wt% Al2O3
COMPOSITION: Cr2O3 <0.02 wt% Cr2O3
COMPOSITION: V2O3 10.0 wt% V2O3
COMPOSITION: Fe2O3 *0.66 wt% Fe2O3
COMPOSITION: MnO 0.01 wt% MnO
COMPOSITION: MgO 0.64 wt% MgO
COMPOSITION: Na2O 0.04 wt% Na2O
COMPOSITION: K2O 9.07 wt% K2O
COMPOSITION: Total 47.76 wt%

COMPOSITION_TRACE: Ca < 20 ppm

COMPOSITION_DISCUSSION:

* All Fe reported given as total Fe wt% (includes both FeO and Fe2O3.

Done by George Breit.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

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 4273 0.2-3.0µm 200 g.s.=

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

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