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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Tremolite HS18 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS18
MINERAL_TYPE: Inosilicate
MINERAL: Tremolite (Amphibole group)
FORMULA: Ca2Mg5Si8O22(OH)2
FORMULA_HTML: Ca2Mg5Si8O22(OH)2
COLLECTION_LOCALITY: St. Lawrence County, New York
ORIGINAL_DONOR: Hunt and Salibury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Forms series with Actinolite and Ferroactinolite.
"S-1A. Amphibole, variety Tremolite. St. Lawrence Co., N.Y. (18B). This sample has a fairly prominent broad band near 1µ, indicating that it contains some ferrous ion. It displays a very sharp band at 1.4µ, and less sharp bands between 2.0 and 2.5 µ due to the overtone and combination tones of the OH stretch, respectively. In particular, the bands at 2.2 and 2.3 µ are due to combination tones of the OH stretch with lattice modes. The weak band at 1.9µ is probably due to a small amount of molecular H2O in the sample."
Hunt, G.R., J.W. Salisbury, 1970, Visible and near-infrared spectra of minerals and rocks: I. Silicate minerals. Modern Geology, v. 1, p. 283-300.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Tremolite + medium amount quartz + small amount of mica + large amount of others; M: ~1% magnetite, no other minerals visible (Norma Vergo)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 57.70 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.05 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 1.00 | wt% | Al2O3 |
| COMPOSITION: | FeO | 0.34 | wt% | FeO |
| COMPOSITION: | MnO | 0.33 | wt% | MnO |
| COMPOSITION: | MgO | 24.45 | wt% | MgO |
| COMPOSITION: | CaO | 12.26 | wt% | CaO |
| COMPOSITION: | Na2O | 0.51 | wt% | Na2O |
| COMPOSITION: | K2O | 0.15 | wt% | K2O |
| COMPOSITION: | Total | 97.79 | wt% |
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
Average of 6 analyses.
XFe+2 = 0.0083
XFe+3 = 0.0083
XMg+2 = 0.9924
XFetot = 0.0151
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2_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 5033 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 6886 | 0.2-3.0µm | 200 | g.s.= |
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