Fig. 2.5 Orthopyroxene of the Tarumae-a (Ta-a) tephra. (a) Ta-a tephra labeled as H5–2 in the soil
profile, (b) optical micrograph of the 2–0.25 mm fraction separated from the Ta-a tephra, (c and d)
optical micrograph and SEM image of an orthopyroxene particle, respectively, (e) EDX spectrum of
the dashed area of (d), (f, g, and h) EDX spectra-mimic graphs showing the elemental compositions
of orthopyroxenes with the maximum, intermediate, and minimum number of Mg atoms (Deer et al.
1997b), (i and j) powder XRD pattern of the orthopyroxene particles and reference powder XRD
pattern, respectively (Joint committee on powder diffraction standards 1986)
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2 Primary Minerals
profile, (b) optical micrograph of the 2–0.25 mm fraction separated from the Ta-a tephra, (c and d)
optical micrograph and SEM image of an orthopyroxene particle, respectively, (e) EDX spectrum of
the dashed area of (d), (f, g, and h) EDX spectra-mimic graphs showing the elemental compositions
of orthopyroxenes with the maximum, intermediate, and minimum number of Mg atoms (Deer et al.
1997b), (i and j) powder XRD pattern of the orthopyroxene particles and reference powder XRD
pattern, respectively (Joint committee on powder diffraction standards 1986)
18
2 Primary Minerals