Verde Lavras Granite (orthogneiss, Paleoproterozoic, 1.9 Ga; Lavras, Minas Gerais State, Brazil) : 無料・フリー素材/写真
Verde Lavras Granite (orthogneiss, Paleoproterozoic, 1.9 Ga; Lavras, Minas Gerais State, Brazil) / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Verde Lavras Granite - a Paleoproterozoic (1.9 billion years) orthogneiss (metamonzogranite) from Lavras in Minas Gerais State, southeastern Brazil. The gneissic foliation is on a coarse scale, but is still recognizable (see elongated, large, greenish-gray feldspars & the elongated, irregularly wavy, black mafic areas). This rock has plagioclase feldspar, quartz, perthitic microcline feldspar, hornblende amphibole, and biotite mica.-----------------Gneiss is a common high-grade, foliated metamorphic rock characterized by alternating bands of light- and dark-colored minerals. It forms by metamorphism of schists or felsic-to-intermediate intrusive igneous rocks (e.g., granite). |
| 撮影日 | 2014-08-02 20:22:18 |
| 撮影者 | James St. John |
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