Clark and others 2007 USGS Data Series 231
Spectral Library splib06a Sample Description

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

TITLE: Gypsum SU2202 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: SU2202

MINERAL_TYPE: Sulfate

MINERAL: Gypsum

FORMULA: CaSO4*2H2O

FORMULA_HTML: CaSO₄•2H₂O

COLLECTION_LOCALITY: unknown

ORIGINAL_DONOR: Ward Natural Science Collection

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

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

SAMPLE_DESCRIPTION:

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Pure (?).

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 gr sz distribution:
mode 1 225 µm @ 35 vol%
mode 2 13 µm @ 65 vol%

average grain size= 133 µm

Smaller grains coat 90% of larger grain surfaces. Very soft, well developed cleavage, biaxial, no contaminants. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_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 1889	0.2-3.0µm	200	g.s.= 133 µm
LIB_SPECTRA:	splib05a r 3003	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib06a r 8850			g.s.=