TITLE: Rutile HS137 DESCRIPT
COLLECTION_LOCALITY: Graves Mountain, Georgia
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
"O-15B. Rutile. Graves Mt., Ga. (137B). This sample was ground from a single crystal of rutile, which was, unfortunately, coated on the surface and within microfractures with limonite. We were unable to completely remove this by acid leaching. The effect of the ferric ion is seen even more strongly here than in the previous sample. In the near-infrared, the ferric ion band near 0.9µ is well displayed in the finest size fraction and the general sloping off to the blue due to extrinsic absorption and tailing of the TiO2 absorption edge is even more evident. Water bands in the limonite are weakly displayed near 1.4, 1.9 and near 2.3µ. The ferric ion bands may be due in part to ferric ion in the rutile lattice, and in part to ferric ion in the limonite coating."
Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1971, Visible and near-infrared spectra of minerals and rocks: III. Oxides and hydroxides. Modern Geology, v. 2, p. 195-205.
40 kV - 30 mA, 6.5-9.5 keV
Files: rutil137.out, -.mdi, ground once; rut137-2.*, ground twice
References: JCPDS 21-1276 (rutile); Huebner's reference patterns; SEM X-ray spectroscopy
Found: Rutile, minor quartz, traces of hematite, probable chlorite, and weak to very weak unidentified reflections 4.57, 4.17, 3.167, 3.079, and 3.056 angstroms
Comments: Very-well crystallized. X-ray spectra suggest one phase contains Ti and Si, another Fe-Al-P.
J.S. Huebner, J. Pickrell, T. Schaefer, written communication 1994
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 4295 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=