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TITLE: Pyrite GDS483 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS483
MINERAL_TYPE: Sulfide
MINERAL: Pyrite (Pyrite group)
FORMULA: FeS2
FORMULA_HTML: FeS2
COLLECTION_LOCALITY: Armejun, Spain
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: Roger N. Clark
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Forms series with Cattierite (CoS2). Dimorphous with Marcasite.
"SS-19. Pyrite. Rico, Colorado (35). Pyrite, FeS2, is the most common and widespread of sulphides. It occurs in igneous, metamorphic and sedimentary rocks, as well as in veins. In the visible, pyrite displays the reflectivity vs. particle size behavior that is peculiar to opaque minerals - ie. reflectivity decreases as particle size decreases. It is also interesting that decreased absorption in the red region of the visible results in a significant contrast in reflectivity from the red to the blue, despite the sample's overall low reflectivity. In the near-infrared, the spectral behavior of pyrite changes from that of an opaque material to that of a transparent one.
This sample was ground from one of the original cubes of pyrite. The sample was sieved
into;
<20µm (a), 20-30µm (b), 30-60µm (c), 60-104µm (d), 104-150µm
(e), 150-250µm (f), 250-1000µm (g) and >1000µm (h) size fractions.
IMAGE_OF_SAMPLE: Not Available
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Major pyrite with minor szomolnokite and minor rhomboclase. (Steve Sutley)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2: | wt% | SiO2 | |
| COMPOSITION: | TiO2: | wt% | TiO2 | |
| COMPOSITION: | Al2O3: | wt% | Al2O3 | |
| COMPOSITION: | Cr2O3: | wt% | Cr2O3 | |
| COMPOSITION: | V2O3: | wt% | V2O3 | |
| COMPOSITION: | Fe2O3: | wt% | Fe2O3 | |
| COMPOSITION: | FeO: | wt% | FeO | |
| COMPOSITION: | NiO: | wt% | NiO | |
| COMPOSITION: | MnO: | wt% | MnO | |
| COMPOSITION: | MgO: | wt% | MgO | |
| COMPOSITION: | SrO: | wt% | SrO | |
| COMPOSITION: | ZnO: | wt% | ZnO | |
| COMPOSITION: | BaO: | wt% | BaO | |
| COMPOSITION: | CaO: | wt% | CaO | |
| COMPOSITION: | Li2O: | wt% | Li2O | |
| COMPOSITION: | Na2O: | wt% | Na2O | |
| COMPOSITION: | K2O: | wt% | K2O | |
| COMPOSITION: | P2O5: | wt% | P2O5 | |
| COMPOSITION: | Cl: | wt% | Cl | |
| COMPOSITION: | F: | wt% | F | |
| COMPOSITION: | S: | wt% | S | |
| COMPOSITION: | SO3: | wt% | SO3 | |
| COMPOSITION: | CO2: | wt% | CO2 | |
| COMPOSITION: | H2O+: | wt% | H2O+ | |
| COMPOSITION: | H2O-: | wt% | H2O- | |
| COMPOSITION: | H2O: | wt% | H2O | |
| COMPOSITION: | LOI: | wt% | LOI | |
| COMPOSITION: | -------- | ------ | ---- | --------- |
| COMPOSITION: | Total: | wt% | ||
| COMPOSITION: | O=Cl,F,S: | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total: | wt% |
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
No additional compositional details available.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
The major pyrite bands at 24.9µm, 28.8µm and 34.3µm are clearly seen in the far infrared portion of the spectrum. Water from the salts can be seen throughout the spectrum.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2c3d4b # 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: | splib06a r 18655 | 1.5-150µm | 1000 | g.s.= 30-60µm |
| LIB_SPECTRA: | splib06a r 18701 | 0.35-2.5µm | 200 | g.s.= |