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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: Jarosite SJ-1 (H3O,10-20%) DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: SJ-1

MINERAL_TYPE: Sulfate

MINERAL: Jarosite (Alunite group)

FORMULA: (K,H3O)(Fe+3)3(SO4)2(OH)6

FORMULA_HTML: (K,H3O)Fe+33(SO4)2(OH)6

COLLECTION_LOCALITY: Synthetic, Charlie Alpers, USGS

ORIGINAL_DONOR: Charlie Alpers

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

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

SAMPLE_DESCRIPTION:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

SJ-1 H3O-(10-20%) Jarosite, Box #1, 45 kV - 35 mA, 7.4-9.5 keV
SJ-1 H3O-(10-20%) Jarosite, Box #3, 40 kV - 30 mA, 7.3-9.5 keV
Reference: JCPDS #31-650 (hydronium jarosite)
Found: member of alunite group, spacing's match hydronium jarosite

Comment: Good correspondence with the JCPDS data for synthetic hydronium jarosite and the brownish color suggest this alunite [jarosite?] is iron- and hydronium-rich. The two samples appear to duplicate each other. Both patterns show a very very weak peak at 2.38 angstroms. Sharp peaks indicate good crystallinity."

J.S. Huebner, J. Pickrell, and J. Randow, 1993, written communication.

END_XRD_ANALYSIS.

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

COMPOSITION_DISCUSSION:

Sample contains 10-20% hydronium ion.

Charlie Alpers, personal communication.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

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 2508 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 3822 0.2-3.0µm 200 g.s.=


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