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: Actinolite_Dolomite BR93-60B DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: BR93-60B

MIXTURE_TYPE: Intimate

MIXTURE: Actinolite (Inosilicate - Amphibole group), Dolomite (Dolomite group), and other minor minerals

FORMULA: Ca2(Mg,Fe+2)5Si8O22(OH)2, CaMg(CO3)2, and others

FORMULA_HTML: Ca₂(Mg,Fe⁺²)₅Si₈O₂₂(OH)₂, CaMg(CO₃)₂, and others

COLLECTION_LOCALITY: Galway Lake (western edge), Barstow, CA, USA

COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)

DATUM: Not Available # coordinate datum

ORIGINAL_DONOR: Eric Livo

CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Actinolite on a Limestone skarn outcrop with iron and manganese oxides (desert varnish), adjacent to a zone of iron mineralization, epidote, and chlorite.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Major: Calcite
Minor: Antigorite, Clinochlore, Lizardite, and Orthochrysotile
Trace: Dolomite
Note: XRD characterized rock surface that did not contain the spectrally measured actinolite coating

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

No Additional compositional details available.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

IMAGE_OF_SAMPLE: Not Available

SPECTROSCOPIC_DISCUSSION:

Actinolite surface coating on calcite. Broad generic Fe+2 one micron absorption feature with strong 1.39, 2.31, and 2.39 actinolite features.
The sharp 1.39 micron OH feature (with the 2.3 features) identifies actinolite.
The minor minerals identified with XRD may slightly influence the actinolite spectrum.

END_SPECTROSCOPIC_DISCUSSION.

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