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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Mascagnite GDS65 Ammon Sulfate DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS65
MINERAL_TYPE: Sulfate
MINERAL: Mascagnite (Ammonium Sulfate)
FORMULA: (NH4)2SO4
FORMULA_HTML: (NH4)2SO4
COLLECTION_LOCALITY: None, Chemical Reagent
ORIGINAL_DONOR: None
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
The sample is from a chemical reagent, pure.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV-30 mA, 6.5-9.5 keV
File: mascag65.mdi (smear on quartz plate)
References: PDF2 #40-0660, 41-0621
Found: Mascagnite
Comments: Peaks are very sharp and some show excellent resolution of the
alpha1-alpha2 components. Search-match returned no satisfactory hits. PDF2
#40-0660 (synthetic (NH4)2SO4) matches the observed pattern; 41-0621, also a
synthetic ammonium sulfate, does not match as well. There is a severe discrepancy
in that the (200) reflection, at 3.89 angstroms in mascag65, has relative
intensity eight times greater than in either reference pattern. Some peak
shoulders, for instance the (200), and split tips, as in the case of the (020)
and (111), are not explained by the PDF2 data.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
Chemical Reagent, pure.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Crystals appear pure under the microscope.
The coarse fraction: Clumps of average grain size 300µm are in polygranular masses with average size of 600µm. G. Swayze
The fine fraction: average grain size = 150µm R. Clark
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_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 2926 | 0.2-3.0µm | 200 | g.s.= 600 µm |
| LIB_SPECTRA: | splib04a r 2936 | 0.2-3.0µm | 200 | g.s.= 150 µm |
| LIB_SPECTRA: | splib05a r 4303 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 4315 | 0.2-3.0µm | 200 | g.s.= |
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