MINERAL: Chalcedony (var. of Quartz)
COLLECTION_LOCALITY: Cuprite, Nevada
ORIGINAL_DONOR: Greg Swayze
COLLECTION_LATITUDE: N37 32.43' # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: W117 10.25' # degrees and decimal minutes (W or E) P> DATUM: NAD27 # coordinate datum
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SEM analyses shows crystal morphology indicative of chalcedony. G. Swayze
Nicolet measurement was made of a sample split that was ground for XRD measurement.
Quartz, from Steve Sutley, written communication, 1992
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
Spectrum has absorptions characteristic of chalcedony with a strong OH fist overtone band at 1.4211 microns, a structual water band at 1.9193 microns, and a Si-OH combination band at 2.2164 microns. The 1.4211 micron band lacks a shoulder on the long wavelength side of the absorption indicating that this sample does not contain detectable amounts of opal.
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history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.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: 1a2a3a4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns