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DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS732
MINERAL_TYPE: Sulfate
MINERAL: Jarosite (K-jarosite) (Synthetic) (Alunite Group)
FORMULA: (H3O,K)Fe3+3-n(SO4)2(OH2)3n(OH)6-n
FORMULA_HTML: (H3O,K)Fe+33-n(SO4)2(OH2)3n(OH)6-3n
COLLECTION_LOCALITY:
COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)
DATUM: Not Available # coordinate datum
ORIGINAL_DONOR: G. Swayze
CURRENT_SAMPLE_LOCATION: Denver GDS Collection
ULTIMATE_SAMPLE_LOCATION: Denver GDS Collection
SAMPLE_DESCRIPTION:
Prepared at 200C for 6 hours in a Parr Bomb container by G. Swayze using KOH and Fe2(SO4)3.nH2O reagents.
IMAGE_OF_SAMPLE: Not Available
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Sample is K-jarosite (or possibly hydromium K-jarosite) with no impurity observed in its XRD pattern. B. Benzel.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
No additional compositional details available.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION: The spectrum of this sample has absorptions characteristic of stoichiometric K-jarosite, however, the presence of an OH2 absorption at 1.93 microns and weak shoulder at 1.97 microns, likely due to minor H3O in its alkali site, indicates deficient Fe3+ with charge compensating protonated OH and a hydronium component respectively. For more information on these absorptions see: Swayze, G.A., Desborough, G.A., Smith, K.S., Lowers, H.A., Hammerstrom, J.M., Diehl, S.F., Leniz, R.W., and Driscoll, R.L., 2008, Chapter B: Understanding jarosite - from mine waste to Mars, in Understanding Contaminants Associated With Mineral Deposits, P.L. Verplanck (ed.), U.S. Geological Survey Circular 1320, p. 8-13. G. Swayze.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns