DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS116.1B, HS116.2B, HS116.3B, HS116.4B
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: San Bernadino, CA
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Forms a series with Tremolite and Ferro-actinolite.
Original spectrum published in:
Hunt, G.R., J.W. Salisbury, 1970, Visible and near-infrared spectra of minerals and rocks: I. Silicate minerals. Modern Geology, vol. 1, pp283-300.
With the note that this sample lacks the contamination by opaque inclusions that is seen in the actinolite sample HS22.
A spectrum of this sample is also published in:
Clark, R.N., T.V.V. King, M. Klejwa, G. Swayze, and N. Vergo, 1990, High spectral resolution reflectance spectroscopy of minerals: J. Geophys Res., v. 95, 12653-12680.
Where it is noted that, although XRD indicates chlorite but no chlorite bands are seen spectrally, microscope analysis indicated ~1% opaque and ~5 volume% chlorite as contaminants.
Grain size fractions are indicated by the extension after the sample number:
.1B = <5 µm
.2B = <74 µm
.3B = 74-250 µm
.4B = 250-1200 µm
Analysis of cation proportions indicates that this actinolite is low enough in iron to border on being called a tremolite.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Analysis by Norma Vergo indicates Actinolite + Chlorite
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EPMA # XRF, EPMA, ICP(Trace), WChem
COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
---|---|---|---|---|
COMPOSITION: | SiO2 | 57.78 | wt% | SiO2 |
COMPOSITION: | TiO2 | 0.02 | wt% | TiO2 |
COMPOSITION: | Al2O3 | 0.22 | wt% | Al2O3 |
COMPOSITION: | Cr2O3 | 0.06 | wt% | Cr2O3 |
COMPOSITION: | FeO | 4.38 | wt% | FeO |
COMPOSITION: | MnO | 0.12 | wt% | MnO |
COMPOSITION: | MgO | 22.39 | wt% | MgO |
COMPOSITION: | CaO | 12.13 | wt% | CaO |
COMPOSITION: | Na2O | 0.38 | wt% | Na2O |
COMPOSITION: | K2O | 0.07 | wt% | K2O |
COMPOSITION: | Total | 97.55 | wt% | |
COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
COMPOSITION: | New Total | wt% |
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION: EM analysis by Gregg A. Swayze at USGS Branch of Geophysics, Denver.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Clark, R.N., T.V.V. King, M. Klejwa, G. Swayze, and N. Vergo, 1990, High spectral resolution reflectance spectroscopy of minerals: J. Geophys Res. 12653-12680.
Bimodal grain size distribution:
population 1 avg. grain size= 325 µm 99 vol%
population 2 avg. grain size = 15 µm <1 vol%
avg. grain size for entire populations = 325 µm
Note the presence of ~1% opaque and ~5 volume% chlorite as inclusions. Actinolite prisms bounded by cleavage surfaces. G. Swayze
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_3_4_ # HS116.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS116.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS116.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS116.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns