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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Actinolite NMNHR16485 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMNHR16485
MINERAL_TYPE: Inosilicate
MINERAL: Actinolite (Amphibole group)
FORMULA: Ca2(Mg,Fe+2)5Si8O22(OH)2
FORMULA_HTML: Ca2(Mg,Fe+2)5Si8O22(OH)2
COLLECTION_LOCALITY: Unknown.
ORIGINAL_DONOR: National Museum of Natural History
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Actinolites are the intermediate members of a complete solid solution series with tremolite, Ca2Mg5Si8O22(OH)2, and ferroactinolite, Ca2Fe5Si8O22(OH)2, as end members. Actinolite is a characteristic mineral of the greenschist facies of metamorphism.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Tremolite + talc + 2.878. (Norma Vergo)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
avg. grain size = 35µm
Mostly prismatic fibrous grains partially coated with smaller grains. These grains have inclined extinction, prismatic cleavage, and slight green color indicating presence of Fe. Grains are length slow, with angle between Z and C axes (OAP ll (010)') = 16-20 degrees. This falls into the tremolite range according to D. Shelly (1985, Optical Mineralogy, 2nd Ed., Elsevier, New York, Table 9.1, p214.) G. Swayze
Spectroscopic data in the .5 to 2.5 µm indicate a low iron actinolite, confirming the above microscopic examination. Roger N. Clark
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 73 | 0.2-3.0µm | 200 | g.s.= 35 µm |
| LIB_SPECTRA: | splib05a r 119 | 0.2-3.0µm | 200 | g.s.= |
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