(For further information on spectroscopy, see:
TITLE: K-Alunite CU91-217G1 High Temp? DESCRIPT
MIXTURE: K-alunite + other mineral phases
COLLECTION_LOCALITY: Alunite Hill, Western Alter. Center, Cuprite, Nevada, USA
ORIGINAL_DONOR: Gregg Swayze
COLLECTION_LATITUDE: N37 31.45' # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: W117 12.72' # 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 was collected next to a fault along which hydrothermal fluids may have emerged near the center of alunite hill in the southwestern portion of the relict hydrothermal center at Cuprite, NV. The sample may have been part of the lower Cambrian Harkless Phyllite or a Tertiary rhyolitic tuff which was altered by the hydrothermal fluids about 7.5 Ma.
K-alunite and quartz.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
The spectrum has absorptions characteristic of alunite. The intense absorption features may indicate that the alunite formed at relatively high temperatures if the sample is deficient in Al.
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history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.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 7233||0.2-3.0µm||200||g.s.=|
|LIB_SPECTRA:||splib06a r 23924||g.s.=|