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DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS1073
MINERAL_TYPE: Carbonate
MINERAL: Aragonite (calcite is also a polymorph of CaCO3)
FORMULA: CaCO3
FORMULA_HTML: CaCO3
COLLECTION_LOCALITY:
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: Helen Folger, USGS, Reston, VA
CURRENT_SAMPLE_LOCATION: Denver GDS Collection
ULTIMATE_SAMPLE_LOCATION: Denver GDS Collection
SAMPLE_DESCRIPTION:
Sample purified from snail shells in soil samples collected from Rio Grande deltaic floodplain deposits.
IMAGE_OF_SAMPLE: Not Available
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Sample is aragonite with trace amounts of calcite and albite. B. Benzel.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
No additional compositional details available.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION: The upturn in the UV may be real or an artifact; additional UV measurements will be needed to confirm if the absorption is real. The main CO3-related absorption in this spectrum is located at 2.3151 microns with a weak shoulder at 2.2977 microns. The longer wavelength shoulder at 2.3480 microns is probably related to trace levels of calcite indicated by the x-ray diffraction analysis. This sample has strong H2O-related features at 1.4434 and 1.9385 microns likely incorpated in the shell material this sample was purified from. G. Swayze.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns