TITLE: Wollastonite HS348 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS348

MINERAL_TYPE: Inosilicate

MINERAL: Wollastonite

FORMULA: CaSiO3

FORMULA_HTML: CaSiO3

COLLECTION_LOCALITY: Santa Fe Mine, Pichucalco, Chiapas, Mexico

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Sieve interval 74-250µm.

"Results of petrographic examination: Single crystal 2 x 0.5 x 1 cm and one large piece 4 x 0.5 x 1. cm. One dirty surface and sulfide inclusions which were separated by crushing and hand picking. Under petrographic microscope, some grains show a little alteration and inclusions or voids along cleavage directions - possible exsolved pyroxene?"

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:

X-ray analysis indicates sample is pure.

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_XRD_ANALYSIS.

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

COMPOSITION: SiO2 50.84 wt% SiO2
COMPOSITION: TiO2 0.01 wt% TiO2
COMPOSITION: Al2O3 0.05 wt% Al2O3
COMPOSITION: FeO 0.18 wt% FeO
COMPOSITION: MnO 0.75 wt% MnO
COMPOSITION: MgO 0.08 wt% MgO
COMPOSITION: CaO 47.62 wt% CaO
COMPOSITION: Na2O 0.01 wt% Na2O
COMPOSITION: K2O 0.03 wt% K2O
COMPOSITION: Total 99.57 wt%

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

Microprobe analysis shows that sample is homogeneous between and within grains. Average of 7 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:

Colorless transparent to white. Almost no contamination visually apparent. Insignificant number of crystals with small (1/50th the size of the wollastonite crystal) inbedded dark grains.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1_2_3_4_

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment

LIB_SPECTRA: splib04a r 5170 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=