FORMULA: CaCO3 + impurities
FORMULA_HTML: CaCO3 + impurities
COLLECTION_LOCALITY: 6 km north of western center, Cuprite, Nevada, USA
ORIGINAL_DONOR: Gregg Swayze
COLLECTION_LATITUDE: N37 36.908' # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: W117 14.393' # 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 from a large outcrop of the Cambrian Mule Springs Limestone exposed about 6 km north of the western alteration center at Cuprite, NV. The surface measured spectrally is the weathered surface of the sample.
calcite (major), quartz (trace)
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EPMA, ICP(Trace), WChem
The spectrum has absorptions that are characteristic of calcite with a main C-O related absorption at 2.3391 microns. The monotonic negative slope toward shorter wavelengths may be caused by organic impurities.
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history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.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: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns