SAMPLE_ID: GDS65.a, GDS65.b
MINERAL: Mascagnite (Ammonium Sulfate)
COLLECTION_LOCALITY: None, Chemical Reagent
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
The sample is from a chemical reagent, pure.
Grain size fractions are indicated by the extension after the sample number:
.a = coarse fraction (lumps of average grain size 300µm are in polygranular masses with average size of 600µm)
.b = fine fraction (average grain size = 150µm)
40 kV-30 mA, 6.5-9.5 keV
File: mascag65.mdi (smear on quartz plate)
References: PDF2 #40-0660, 41-0621
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.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
Chemical Reagent, pure.
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
SPECTRAL_PURITY: 1a2a3a4_ # GDS65.a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # GDS65.b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns