TITLE: Rhodonite HS325 DESCRIPT
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
This sample contains very small amounts of magnetite, pyrolusite and calcite. The visible spectrum is dominated by features typical of Mn2+ transitions, displaying bands at 0.35 µ, 0.37 µ, 0.42 µ, and 0.55 µ, resulting in the characteristic pink color of this mineral. The strong broad band near 1.04 µ and 1.9 µ features are typical of molecular water, probably in fluid inclusions.
Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and near-infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geology, v. 4, p. 85-106.
40 kV - 30 mA, 7.3-9.5 keV
References: Huebner's reference patterns; PDF2 #29-0985
Comments: Peaks are symmeteric but not strong; alpha1-alpha2 are not resolved. The pattern has a high background caused by X-ray fluorescence (Mn- or Fe-rich composition is probable). HS-325 is very similar to Huebner's reference patterns for synthetic pyroxmangite of MnSiO3 composition (runs Hy-67 and run-130) and unlike that of rhodonite (run49; see Hueber, 1986). Profile based search-match returns pyroxmangite (PDF2 #29-0985) There are weak, very sharp reflections at 7.2 and 1.912 angtroms but no mineral in the PDF2 database has two strong reflections at these positions.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 4208 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.=