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: Muscovite HS146 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS146.1B, HS146.3B, HS146.4B

MINERAL_TYPE: Phyllosilicate

MINERAL: Muscovite (Mica group)

FORMULA: KAl2Si3O10(OH)2

FORMULA_HTML: KAl₂Si₃O₁₀(OH)₂

COLLECTION_LOCALITY: Fremont County, Colorado

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"P-14 Muscovite 146B--Fremont Co., Colorado. K₂Al₄(Si₆Al₂O₂₀)(OH,F)₄: Muscovite is one of the most common micas, occurring in acidic rocks, granitic pegmatites, schists etc. It frequently contains small amounts of ferrous and ferric iron, magnesium, manganese, chromium, calcium, sodium, lithium, vanadium and titanium. This spectrum is essentially identical with that of muscovite 24B (see Part I, p. 294, spectrum S-12). The weak broad band near 0.9µ, the very weak sharp feature near 0.44µ and the fall off to the blue are due to a small amount of ferrous iron substituting for aluminum. The near infrared bands due to the hydroxyl ion are essentially identical with those in the lepidolite spectrum, and the explanation is the same."

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
.3B = 74-250 µm
.4B = 250-1200 µm

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Muscovite - pure. (Norma Vergo)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Not done yet

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # HS146.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4a # HS146.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # HS146.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns