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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: Perthite HS415 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS415

MINERAL_TYPE: Tectosilicate

MINERAL: Microcline with exsolved albite (Feldspar group)

FORMULA: KAlSi3O8 + NaAlSi3O8

FORMULA_HTML: KAlSi3O8 + NaAlSi3O8

COLLECTION_LOCALITY: Perth, Ontario

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"T-13 Perthite 415B--Perth, Ontario. perthite is a name given to intergrown orthoclase or microcline with albite. The spectrum indicates a small amount of water, plus the fall off at 0.55µ similar to the feature discussed for microcline's 151B and 108B, and for orthoclase 82B."

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.

A weak 2.2-µm feature is present, indicating some alteration. Otherwise the spectrum rates an a.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Albite + microcline(L)

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:

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 3851 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 5375 0.2-3.0µm 200 g.s.=


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