U.S. Geological Survey home page


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: Dolomite ML97-3 Ferroan DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: ML97-3

MINERAL_TYPE: Carbonate

MINERAL: Dolomite (Dolomite group)

FORMULA: CaMg(CO3)2

FORMULA_HTML: CaMg(CO3)2

COLLECTION_LOCALITY: Carson Hill Quarry, 7 km SE of Angels, CA

ORIGINAL_DONOR: Carson Hill Quarry

CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.

ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.

SAMPLE_DESCRIPTION:

Ferroan dolomite collected from the Carson Hill Quarry, in the Mother Lode district in the foothills of the Sierra Nevada of California. Sample collected from quarry wall in 1997.

END_SAMPLE_DESCRIPTION:

XRD_ANALYSIS:

Not Available

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum has very strong saturated doublet at 0.9858 and 1.3450 microns probably related to Fe in the dolomite. Strong absorption at 2.3191 microns is due to C-O related and slightly shorter than wavelengths of non-ferroan dolomite (e.g. 2.321 microns).

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 2475 0.2-3.0µm 200 g.s.=


USA.gov logo  Take Pride in America button