Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
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TITLE: Jarosite SJ-1 H3O DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

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

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:

IMAGE_OF_SAMPLE:
NO PHOTO

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, EPMA, 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: 1b2b3b4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns