U.S. Geological Survey home page


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: Rhodonite NMNHC6148 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: NMNHC6148

MINERAL_TYPE: Inosilicate

MINERAL: Rhodonite

FORMULA: (Mn+2,Fe+2,Mg,Ca)SiO3

FORMULA_HTML: (Mn+2,Fe+2,Mg,Ca)SiO3

COLLECTION_LOCALITY: Franklin, New Jersey

ORIGINAL_DONOR: Smithsonian Institution

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"Results of petrographic examination: Hand sample is composed of two fragments, each about 2cm x 2cm x 1cm. About one third of each is host rock on which the rhodonite crystals grow. This was removed by sawing to free pure rhodonite. Under petrographic microscope, many other grains show a small degree of alteration (not identified)."

Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Pure rhodonite.

Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.

Pure (Norma Vergo).

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem

COMPOSITION
KEYWORD
Oxide
ASCII
Amount Weight
Percent, %
Oxide
html
COMPOSITION: SiO2 46.30 wt% SiO2
COMPOSITION: TiO2 0.07 wt% TiO2
COMPOSITION: Al2O3 0.05 wt% Al2O3
COMPOSITION: FeO 0.50 wt% FeO
COMPOSITION: MnO 40.17 wt% MnO
COMPOSITION: MgO 0.41 wt% MgO
COMPOSITION: CaO 8.27 wt% CaO
COMPOSITION: Na2O 0.28 wt% Na2O
COMPOSITION: K2O 0.04 wt% K2O
COMPOSITION: Total 96.09 wt%

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

"Results of XRF or other compositional analysis: Microprobe analysis shows sample is homogeneous between and within grains. Average of six analyses."

Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_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: splib04a r 4198 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 5927 0.2-3.0µm 200 g.s.=


USA.gov logo  Take Pride in America button