U.S. Geological Survey home page


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: Cinnabar HS133 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS133

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.

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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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, EM(WDS), 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: 1c2_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 1053 0.2-3.0µm 200 g.s.= 184 µm
LIB_SPECTRA: splib05a r 1884 0.2-3.0µm 200 g.s.=


USA.gov logo  Take Pride in America button