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: Zoisite HS347 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS347.1B, HS347.2B, HS347.3B, HS347.4B, HS347.6

MINERAL_TYPE: Sorosilicate

MINERAL: Zoisite (Epidote group)

FORMULA: Ca2Al3(SiO4)3(OH)

FORMULA_HTML: Ca₂Al₃(SiO₄)₃(OH)

COLLECTION_LOCALITY: Norway

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"S-2 Zoisite 347--Norway. Ca₂(AlOH)Al₂-(SiO₄)₃. Zoisite, also a metamorphic mineral found in schists and gneisses, is orthorhombic and is dimorphous with clinozoisite. This sample displays extremely intense bands at 0.43, 0.53 and 0.8 µ, indicative of ferric iron possibly with contributions from Mn⁺². The major OH feature is most unusual, occurring at 1.68 µ, as opposed to the normal 1.4 µ position. There is also the unusual weak band at 1.85 µ, and the water feature at 1.9 µ with doubled features at 2.3 µ and 2.35 µ, and another band at 2.48 µ. These features are caused by combinations of OH with lattice or bending modes of ALOH, but the exact nature of these bands is not known."

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.

Grain size fractions are indicated by the extension after the sample number:
.1B = <5 µm
.2B = <74 µm
.3B = 74-250 µm
.4B = 250-1200 µm
.6 = cut slab

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Zoisite + medium amount quartz + small amount other(s);
M: ~40% quartz, feldspar may be present

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_ # HS347.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS347.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2b3c4c # HS347.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS347.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1c2_3_4_ # HS347.6 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns