DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: WS592
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: Klammath, OR
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: dipsd592.mdi
References: PDF2 #41-1370; Huebner's cell refinement for diopside, Rotkopschart,
Zillertal, Austria
Found: Clinopyroxene
Comments: Very sharp peaks and excellent resolution of alpha1-alpha2 components indicate
excellent crystallinity and compositional homogeneity. All observed reflections indexed
can be diopside-rich clinopyroxene. Lattice spacings are slightly smaller than HS-15,
HS-119, and synthetic endmember diopside. Profile-based search match returns aluminian
augite (41-1370, 5.4 percent, Al2O3), which is an excellent visual match to WS-592. Unit
cell dimensions are a=9.728(4), b=8.904(4), c=5.258(2) angstroms, and beta=106.39(4)
degrees. These observations are consistent with diopsidic augite.
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 sz = 223 µm at 60 vol%
pop 2 sz = 40 µm at 40 vol%
avg gr sz = 174 µm
Trace magnetite. Two cleavages at nearly right angles, inclined extinction, slight pleochroism?, pale green color, high order color under cross-polarized light, biaxial (+). All consistent with augite. 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 614 0.2-3.0µm 200 g.s.= 174 µm
LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=