Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: Blue_Efflorscnt_Min SU93-300 DESCRIPT

DOCUMENTATION_FORMAT: Mixture

SAMPLE_ID: SU93-300

MIXTURE_TYPE: Intimate

MIXTURE: Copper bearing salt crust (possible chalcanthite, brochantite)

FORMULA: Cu2+SO4.5H2O (chalcanthite) and Cu2+4(SO4)(OH)6 (brochantite)

FORMULA_HTML: Cu²⁺SO₄.5H₂O and Cu²⁺₄(SO₄)(OH₆

COLLECTION_LOCALITY: North Pit at Summitville Mine Site, CO

ORIGINAL_DONOR: Goeff Plumblee

CURRENT_SAMPLE_LOCATION: USGS Spectroscopy Laboratory, Denver

ULTIMATE_SAMPLE_LOCATION: USGS Spectroscopy Laboratory, Denver

SAMPLE_DESCRIPTION:

Sampled from Summitville north pit on gray clay (?) substrate

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

possible chalcanthite, brochantite

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EM(WDS), ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

NONE

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

none

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum has a broad asymmetric absorption at 0.7616 microns that may be related to a Cu electronic absorption. An absorption near 1.7 microns may be due to sulfate.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

LIB_SPECTRA_HED:	where	Wave Range	Av_Rs_Pwr	Comment
LIB_SPECTRA:	splib05a r 7513	0.2-3.0µm	200	g.s.=

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