Clark and others 2007 USGS Data Series 231
Spectral Library splib06a Sample Description

(For further information on spectroscopy, see: http://speclab.cr.usgs.gov)

TITLE: Richterite HS336 Amphibole DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS336

MINERAL_TYPE: Inosilicate

MINERAL: Richterite (Amphibole group)

FORMULA: Na2Ca(Mg,Fe2+,Mn,Fe3+,Al)5(Si8O22)(OH,F)2

FORMULA_HTML: Na₂Ca(Mg,Fe²⁺,Mn,Fe³⁺,Al)₅(Si₈O₂₂)(OH,F)₂

COLLECTION_LOCALITY: Sweden

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"I-21 Richterite 336B--Sweden. Na₂Ca(Mg, Fe²⁺, Mn, Fe³⁺, Al)₅(Si₈O₂₂)(OH, F)₂: This mineral occurs in thermally metamorphosed limestone's and skarns, and is also found as a hydrothermal product in veins in alkaline igneous rocks. This sample is contaminated with 30% magnetite, which reduces the overall reflectivity. It would also serve to quench the iron bands, were any displayed. However, the curve shown is for a sample cleaned of all magnetite, and it is still surprisingly free of electronic transition bands for an amphibole. The only well defined features are the 1.4µ OH band, which is clearly doubled, and the two OH bands near 2.32µ and 2.38µ."

Sieve interval 74 - 250µm.

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.

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Not Available

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: 1c2c3c4c # 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:	splib04a r 4219	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib05a r 5939	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib06a r 19444			g.s.=
LIB_SPECTRA:	splib06a r 19456			g.s.=