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Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: Muscovite HS146 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS146

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."

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:

Muscovite - pure. (Norma Vergo)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), 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_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 3364 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 4805 0.2-3.0µm 200 g.s.=


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