Sennan (Osaka Pref.) Rhyolite
:  Field width = 8.8mm A caption is in the bottom. The Image is XPL on mouse to PPL
泉南(大阪府)の流紋岩 横幅8.8mm.写真の下に説明.薄片写真:クロスポーラー(XPL).マウスを乗せるとオープンポーラー(PPL). 
The
 matrix includes some fragments of lava or pumice, so it may be 
recomennded to call a tuff breccia. Grey phenocrysts under XPL are 
quartz. 
軽石や溶岩の破片を含むようなので,凝灰角礫岩と呼ぶ方がよいかも知れない.XPLで灰色の斑晶は石英.
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