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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: Actinolite_Dolomit 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, EM(WDS), 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

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib05a r 7155 0.2-3.0µm 200 g.s.=


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