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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
For more information on the library, see: local link web link

TITLE: Cinnabar HS133 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS133.3B

MINERAL_TYPE: Sulfide

MINERAL: Cinnabar

FORMULA: HgS

FORMULA_HTML: HgS

COLLECTION_LOCALITY: Manhattan, Nevada

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Trimorphous with Metacinnabar and Hypercinnabar.

This sample is impure, and contains 0.6% iron by weight. This is enough iron to be present as the oxide, however, and to provide the characteristic absorptions near 0.85µm. The sample also contains bound hydrated water (1.4, 1.9, and 2.2-2.4µm absorptions) attached to the ferric oxide.

Hunt, G.R., J.W. Salisbury, C.J. Lenhoff, 1971, Visible and Near-Infrared spectra of Minerals and Rocks: IV. Sulfides and Sulfates. Mod. Geol. 3, pp 1-14.

IMAGE_OF_SAMPLE:
Photo of sample

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Cinnabar - major component
No other identifiable components
No sign of iron oxide

Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

mode:
60 vol% cinnabar
40 vol% cinnabar coated quartz and feldspar

bimodal grain size distribution:

60 vol% 199 µm cinnabar
5 vol% 10 µm cinnabar coating other grains

normalized avg. grain size of cinnabar = 183 µm
grain size feld/qtz = 199 µm

Coatings of cinnabar on feld/qtz grains avg. about 20-30% of felds/qtz surface. Blood red color, red translucent, multiple good cleavages. All consistent with cinnabar. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1c2d3d4d # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns