DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS345.1B, HS345.2B, HS345.3B, HS345.4B, HS345.6
MINERAL_TYPE: Inosilicate
MINERAL: Uralite (Amphibole group)
FORMULA: Ca2(Mg,Fe2+)5(Si8O22)(OH,F)2
FORMULA_HTML: Ca2(Mg,Fe2+)5(Si8O22)(OH,F)2
COLLECTION_LOCALITY: Calumet, Colorado
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
I-15 Uralite 345B--Calumet, Colo. Ca2(Mg,Fe2+)5(Si8O22)(OH,F)2: This is a hornblende formed by alteration of pyroxenes. It is generally actinolitic in composition, but often contains aluminum (Deer and others, 1963). Its spectrum shows a doubled iron feature near 0.75 and 1.0µ, the former due to Fe3+ substituting for Al, the latter due to Fe2+ substituting for Mg. The 1.4µ hydroxyl feature is considerably weaker than the 2.32µ and 2.38µ hydroxyl bands. The 1.9µ band indicates a slight amount of included water."
Sieve interval 74 - 250µm.
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.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Amphibole - major (hornblende?)
Clinopyroxene - major (augite?)
Unidentifiable residual
Note: Uralite is described as an amphibole psuedomorphous after
pyroxene.
Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.
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: 1b2_3_4_ # HS345.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS345.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2c3c4u # HS345.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS345.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS345.6 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns