|
|
(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Datolite SU51399 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: SU51399
MINERAL_TYPE: Nesosilicate
MINERAL: Datolite
FORMULA: CaBSiO4(OH)
FORMULA_HTML: CaBSiO4(OH)
COLLECTION_LOCALITY: None
ORIGINAL_DONOR: None
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
None
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.5-9.5 keV
File: dat51399_mdi, *.out (smear mount on quartz plate)
References: JCPDS #36-429
Found: Datolite, unindexed very weak reflections at 3.03 and 1.838 angstroms
Comment: The very weak reflections may be datolite reflections that are too weak to
be listed by JCPDS. Reflections are very sharp, suggesting excellent
crystallinity.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Mode:
95 vol.% Datolite
5 vol.% Calcite
Bimodal Grain size distribution:
population:1 size = 237 µm at 80 vol%
population:2 size = 15 µm at 20 vol%
average grain size = 210 µm
Biaxial (-), no cleavage, conchoidal fracture, consistent with Datolite. Difficult to optically differentiate Datolite from calcite under microscope. Vol% calcite estimated from number of grains that fizzed with HCl. G. Swayze.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_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 1344 | 0.2-3.0µm | 200 | g.s.= 210 µm |
| LIB_SPECTRA: | splib05a r 2320 | 0.2-3.0µm | 200 | g.s.= |
| AccessibilityFOIAPrivacyPolicies and Notices | |
 |
|