Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
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TITLE: Uralite HS345 DESCRIPT

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.

IMAGE_OF_SAMPLE:

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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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