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: Zincite+Franklin HS147 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: HS147.1B, HS147.2B, HS147.3B, HS147.4B

MIXTURE_TYPE: Intimate

MIXTURE: Zincite + Franklinite

FORMULA: ZnO + (Zn,Mn+2,Fe+2)(Fe+3,Mn+3)2O4

FORMULA_HTML: ZnO + (Zn,Mn⁺²,Fe⁺²)(Fe⁺³,Mn⁺³)₂O₄

COLLECTION_LOCALITY: Franklin, New Jersey

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

0-16. Zincite (plus Franklinite). Franklin, N.J. (147B). Zincite, ZnO, is a very rare mineral found in large amounts exclusively at Franklin, N.J., intimately intergrown with franklinite. The chemical formula for franklinite is usually written ZnFe₂O₄, but shows variations in composition indicated by the more typical formula (Fe, Zn, Mn) (Fe, Mn)₂O₄. Both zincite and franklinite are highly colored, the zincite possibly by the manganese ion (Palache and others, 1944), the franklinite primarily by the ferric ion. Both the ferrous and ferric ions are primarily responsible for the fall- off in reflectivity towards the blue and for the crossover for different particle size samples. The band at 1.15µ is due to the Fe²⁺ ion, and at 0.8µ to Fe³⁺, both of which locate easily in the host zinc oxide crystal and are most marked in the finer particle size. The fall-off in reflectivity is caused by a combination of the presence of ferrous and ferric ion, intrinsic absorption and a tailing off of the zinc oxide conduction band into the visible range."

Sieve interval 74 - 250µm.

Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1971, Visible and near-infrared spectra of minerals and rocks: III. Oxides and hydroxides. Modern Geology, v. 2, p. 195-205. f

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Zincite - major
Franklinite - major
Possible unidentifiable residual

Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # HS147.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS147.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2b3b4_ # HS147.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS147.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns