DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: WS558
MINERAL_TYPE: Inosilicate
MINERAL: Augite (Pyroxene Group)(was listed as Diopside)
FORMULA: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6
FORMULA_HTML: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6
COLLECTION_LOCALITY: Hull, Ontario, Canada
ORIGINAL_DONOR: Wards Mineral Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.7-9.5 keV
File: dipsd588.mdi (smear on qtz plate)
References: Borg and Smith (1969); PDF2 #41-1370, 24-0201; Huebner's reference patterns
and cell refinements, particularly that of diopside from Rotkopschart, Zillertal,
Austria
Found: Clinopyroxene
Comments: Peaks are moderately sharp to sharp but the alpha1-alpha2 components are not
well resolved. The high background is probably due to X-ray fluorescence (suggesting
(Fe and/or Mn are present). All reflections can be indexed as clinopyroxene.
Identification was comfirmed with profile-based search-match (ferroan augite, 24-0201). Lattice
spacings are larger than those of WS-592, HS-15, or synthetic endmember diopside, yet
smaller than those of hedenbergite HS-10. Conclude that this material is a clinopyroxene
solid solution, not an endmember diopside.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Bimodal grain size distribution:
pop 1 gr sz = 450 µm at 80 vol%
pop 2 gr sz = 15 µm at 20 vol%
avg gr sz = 400 µm
Pure sample, inclined extinction, two cleavages at nearly right angles, pale green color, high order colors under cross-polarized light, biaxial (+), weak pleochroism, all consistent with aguite. G. Swayze.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1_2_3_4_
LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 604 0.2-3.0µm 200 g.s.= 400 µm
LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=