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:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1_2_3_4_

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 ____ 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=