(For further information on spectroscopy, see:
TITLE: Halloysite + others CU91-242D DESCRIPT
MIXTURE: Halloysite CU91-242D + other mineral phases
COLLECTION_LOCALITY: Eastern Alteration Center, Cuprite, Nevada, USA
ORIGINAL_DONOR: Gregg Swayze
COLLECTION_LATITUDE: N37 32.07' # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: W117 13.18' # degrees and decimal minutes (W or E) P> DATUM: NAD27 # coordinate datum
CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory
This sample is from the southwestern portion of the western alteration center at Cuprite, NV. The sample is from altered lower Cambrian Harkless Phyllite hydrothermally altered about 7.5 Ma.
Based on glycolation halloysite was found. Also present are quartz, mica, alunite, and possibly dickite.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
The spectrum has absorptions characteristic of halloysite with a band at 2.2 microns with a weak shorter wavelength shoulder. The presence of trace amounts of alunite are indicated by the weak band at 1.477 microns.
See: Swayze, G.A., 1997, The hydrothermal and structural history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.
SPECTRAL_PURITY: 1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
|LIB_SPECTRA:||splib05a r 8268||0.2-3.0µm||200||g.s.=|
|LIB_SPECTRA:||splib06a r 25302||g.s.=|