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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Hypersthene PYX02 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMNHC2368
MINERAL_TYPE: Inosilicate
MINERAL: Hypersthene (Fe-rich enstatite, Pyroxene group)
FORMULA: (Mg,Fe+2)2Si2O6
FORMULA_HTML: (Mg,Fe+2)Si2O6
COLLECTION_LOCALITY: Bamble, Norway
ORIGINAL_DONOR: Wards Scientific, and Robert B. Singer
CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.
ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.
SAMPLE_DESCRIPTION:
Intermediate member of the series Enstatite-Orthoferrosilite.
The
original sample description and vis-nir spectrum was published by:
Singer, R.B., 1981, Near-Infrared spectral reflectance of mineral
mixtures: Systematic
combinations of pyroxenes, olivine, and iron
oxides: J. Geophys Res., v. 86, p. 7967-7982.
The sample is pure
pyroxene except for a small (less than 2%?) amount of tremolite. The tremolite
shows in the spectra as weak (narrow) bands at 2.3 m and 1.4 m.
Singer suspected the tremolite,
but it is confirmed by higher
resolution spectra in this library.
The sample was ground and wet sieved in methanol at the USGS Denver
Spectroscopy Laboratory by Roger Clark. Sieve intervals are:
5-10 µm (g)
10-20 µm (a)
20-30 µm (d)
30-45 µm (e)
45-104 µm (f)
104-150 µm (b)
150-250 µm (c)
>250 µm (h)
SEM photos were done by R. Clark on each sieve interval to characterize the grain sizes. Letter denotes spectrum designation.
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
None
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 55.30 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.05 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 0.12 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | (as FeO) | wt% | Fe2O3 |
| COMPOSITION: | FeO | 9.38 | wt% | FeO |
| COMPOSITION: | MnO | 0.15 | wt% | MnO |
| COMPOSITION: | MgO | 32.80 | wt% | MgO |
| COMPOSITION: | Na2O | 0.00 | wt% | Na2O |
| COMPOSITION: | P2O5 | 0.01 | wt% | P2O5 |
| COMPOSITION: | LOI | 2.00 | wt% | LOI |
| COMPOSITION: | Total | 100.28 | wt% | |
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | 100.28 | wt% |
COMPOSITION_TRACE:
None
COMPOSITION_DISCUSSION:
The compositional analysis is from: Singer, R.B., 1981, Near-Infrared spectral reflectance of mineral mixtures: Systematic combinations of pyroxenes, olivine, and iron oxides: J. Geophys Res., v. 86, p. 7967-7982.
All Fe2O3 is reported in the FeO amount. The analysis was performed by XRA Laboratory, Ontario Canada. FeO was by wet chemistry, all else by XRF.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
The sample appears to be pure pyroxene except for a small (less than ~ 2%) amount of tremolite.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2c3b4b # 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 2263 | 0.2-3.0µm | 200 | g.s.=350 µm |
| LIB_SPECTRA: | splib04a r 2274 | 0.2-3.0µm | 200 | g.s.=180 µm |
| LIB_SPECTRA: | splib04a r 2285 | 0.2-3.0µm | 200 | g.s.=120 µm |
| LIB_SPECTRA: | splib04a r 2296 | 0.2-3.0µm | 200 | g.s.=60 µm |
| LIB_SPECTRA: | splib04a r 2308 | 0.2-3.0µm | 200 | g.s.=34 µm |
| LIB_SPECTRA: | splib04a r 2319 | 0.2-3.0µm | 200 | g.s.=23 µm |
| LIB_SPECTRA: | splib04a r 2330 | 0.2-3.0µm | 200 | g.s.=12 µm |
| LIB_SPECTRA: | splib04a r 2341 | 0.2-3.0µm | 200 | g.s.= 7 µm |
| LIB_SPECTRA: | splib05a r 3431 | 0.2-3.0µm | 200 | g.s.=350 µm |
| LIB_SPECTRA: | splib05a r 3445 | 0.2-3.0µm | 200 | g.s.=180 µm |
| LIB_SPECTRA: | splib05a r 3459 | 0.2-3.0µm | 200 | g.s.=120 µm |
| LIB_SPECTRA: | splib05a r 3473 | 0.2-3.0µm | 200 | g.s.=60 µm |
| LIB_SPECTRA: | splib05a r 3487 | 0.2-3.0µm | 200 | g.s.=34 µm |
| LIB_SPECTRA: | splib05a r 3501 | 0.2-3.0µm | 200 | g.s.=23 µm |
| LIB_SPECTRA: | splib05a r 3516 | 0.2-3.0µm | 200 | g.s.=12 µm |
| LIB_SPECTRA: | splib05a r 3530 | 0.2-3.0µm | 200 | g.s.= 7 µm |
| LIB_SPECTRA: | splib06a r 10409 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10424 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10471 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10486 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10533 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10548 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10595 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10610 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10657 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10672 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10719 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10735 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10782 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10797 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10844 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 10859 | g.s.= |