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
_{For more information on the library, see:
local link
web link}

TITLE: Anorthite HS201.3B Plagio DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS201.3B

MINERAL_TYPE: Tectosilicate

MINERAL: Anorthite (Plagioclase, Ca end member, Feldspar group)

FORMULA: CaAl2Si2O8

FORMULA_HTML: CaAl₂Si₂O₈

COLLECTION_LOCALITY: Japan

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

The original sample and vis-nir spectrum was described in:

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.

However, the sample measured here was purified using a Franz separator and hand picked by Gregg Swayze. The resulting sample and spectrum appear pure (see microscopic examination).

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 6.5-9.5 keV
File: anort201_mdi, *.out (smear mount on quartz plate)
References: J.V. Smith (198-), p.212-3
Found: Calcic- plagioclase consistent with anorthite

Comment: Strong, narrow reflections indicate excellent crystallinity and compositional heterogeneity. This pattern demonstrates the resolving power of the powder diffractometer method.

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2a3a4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns