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
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TITLE: Natrolite HS169 Zeolite DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS169.1B, HS169.2B, HS169.3B, HS169.4B

MINERAL_TYPE: Tectosilicate

MINERAL: Natrolite (Zeolite group)

FORMULA: Na2Al2Si3O10*2H20

FORMULA_HTML: Na₂Al₂Si₃O₁₀•2H₂O

COLLECTION_LOCALITY: Poonah, India

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Dimorphous with Tetranantrolite.

"T-22 Natrolite 169B--Poonah, India. Na₂Al₂Si₃O₁₀2H₂O: The spectral features in this sample are very well resolved and the spectrum displays multiple sharp and weak features, all due to H₂O throughout the entire mid- infrared. The main features are at 0.98µ, 1.19µ, 1.46µ, 1.95µ, 2.2µ, and 2.44µ. The differences in these natrolite spectra indicate that the water is less randomly located in the Poonah sample than in the Springfield sample."

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.

Grain size fractions are indicated by the extension after the sample number:
.1B = <5 µm
.2B = <74 µm
.3B = 74-250 µm
.4B = 250-1200 µm

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Pure natrolite. (Norma Vergo)

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

mode:

100 vol% Natrolite
trace Fe-oxide scale

average grain size= 225 µm

Some clear grains 10% vol, the rest are cloudy white. Grains have micron sized fluid or gas inclusions comprising 40 vol% of zeolite grains. Cannot get optic sign. Low relief grains with straight extinction, and sub-rounded habit (not fibrous). These properties are consistent with this sample being natrolite. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # HS169.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS169.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2b3b4b # HS169.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS169.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns