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: Zoisite HS347 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS347

MINERAL_TYPE: Sorosilicate

MINERAL: Zoisite (Epidote group)

FORMULA: Ca2Al3(SiO4)3(OH)

FORMULA_HTML: Ca2Al3(SiO4)3(OH)

COLLECTION_LOCALITY: Norway

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"S-2 Zoisite 347--Norway. Ca2(AlOH)Al2-(SiO4)3. Zoisite, also a metamorphic mineral found in schists and gneisses, is orthorhombic and is dimorphous with clinozoisite. This sample displays extremely intense bands at 0.43, 0.53 and 0.8 µ, indicative of ferric iron possibly with contributions from Mn+2. The major OH feature is most unusual, occurring at 1.68 µ, as opposed to the normal 1.4 µ position. There is also the unusual weak band at 1.85 µ, and the water feature at 1.9 µ with doubled features at 2.3 µ and 2.35 µ, and another band at 2.48 µ. These features are caused by combinations of OH with lattice or bending modes of ALOH, but the exact nature of these bands is not known."

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.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Zoisite + medium amount quartz + small amount other(s);
M: ~40% quartz, feldspar may be present

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: 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: splib04a r 5202 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 7061 0.2-3.0µm 200 g.s.=


USA.gov logo  Take Pride in America button