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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: Orthoclase HS13 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS13

MINERAL_TYPE: Tectosilicate

MINERAL: Orthoclase (Feldspar group)

FORMULA: KAlSi3O8

FORMULA_HTML: KAlSi3O8

COLLECTION_LOCALITY: Ruggles Mine, New Hampshire

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Forms series with Celsian. Dimorphous with Microcline.

"S-15. Orthoclase. Ruggles Mine, New Hampshire (13B). Orthoclase, KAlSi3O8, is a very common igneous rock-forming mineral, particularly in acidic and intermediate rock. Usually it contains 10 to 25% NaAlSi3O8. Orthoclase should be spectrally featureless in the near-infrared. The bands near 1.4 and 2.0µ are due to water present in microscopic fluid inclusions within the mineral grains."

Sieve interval 74 - 250µm.

Hunt, G.R., J.W. Salisbury, 1970, Visible and near-infrared spectra of minerals and rocks: I. Silicate minerals. Modern Geology, v. 1, p. 283-300.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Na-feldspar(L) + K-feldspar(L) + mica(m)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Sample has relatively strong mica bands in the 2 - 2.5 micron region.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1c2_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 3786 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 5279 0.2-3.0µm 200 g.s.=


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