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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: Calcite CO2004 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: CO2004

MINERAL_TYPE: Carbonate

MINERAL: Calcite (Calcite group)

FORMULA: CaCO3

FORMULA_HTML: CaCO3

COLLECTION_LOCALITY: Alligator Ridge Mine, Nevada

ORIGINAL_DONOR: Phoebe Hauff

CURRENT_SAMPLE_LOCATION: CSES/CIRES, Univ. of CO, Boulder

ULTIMATE_SAMPLE_LOCATION: CSES/CIRES, Univ. of CO, Boulder

SAMPLE_DESCRIPTION:

Forms series with Rhodochrosite. Trimorphous with Aragonite and Vaterite.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Calcite + minor quartz

Kruse, F.A., and P.L. Hauff, eds., 1992, The IGCP-264 Spectral Properties Database. IUGS/UNESCO, Special Publication, 211 p., (in press).

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Bimodal Grain size distribution:
mode 1: 575 µm @ 70 vol%
mode 2: 25 µm @ 30 vol%

avg. gr sz = 480 µm

Uniaxial (-), high birefringence, rhombic cleavage, clear color, vigorous fizz with HCl, all consistent with calcite. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

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: splib04a r 809 0.2-3.0µm 200 g.s.= 480 µm
LIB_SPECTRA: splib05a r 1474 0.2-3.0µm 200 g.s.=


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