DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS23 74-250um
MINERAL_TYPE: Phyllosilicate
MINERAL: Talc
FORMULA: Mg3Si4O10(OH)2
FORMULA_HTML: Mg3Si4O10(OH)2
COLLECTION_LOCALITY: Feiser Mine, Ruby Mountains, Montana
ORIGINAL_DONOR: Jim Crowley
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
"Petrographic examination: Hand sample is massive, fine-grained and slightly greenish in color. Under microscope, sample is cryptocrystalline."
Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Pure talc.
Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2a3a4a # GDS23 74-250um # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns