Graphic granite (runite) (Eight Mile Park Pegmatite District, Mesoproterozoic, 1.430 to 1.474 Ga; roadcut along 3A Road, north of Royal Gorge Bridge, west of Canon City, south-central Colorado, USA) 2 : 無料・フリー素材/写真
Graphic granite (runite) (Eight Mile Park Pegmatite District, Mesoproterozoic, 1.430 to 1.474 Ga; roadcut along 3A Road, north of Royal Gorge Bridge, west of Canon City, south-central Colorado, USA) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Graphic granite in the Precambrian of Colorado, USA. Dark pinkish = K-feldspar (KAlSi3O8 - potassium aluminosilicate)Dark gray = quartz (SiO2 - silica)Graphic granite, also known as runic granite or runite, has an odd but distinctive type of crystalline texture. Graphic granites are typically bimineralic and consist of interpenetrating crystals of quartz and potassium feldspar. The resulting texture somewhat resembles ancient writing (“graphic”). Observed examples resemble Cuneiform, Hebrew, or Arabic writing. These rocks occur in pegmatitic granite intrusions.Geologic unit & age: Eight Mile Park Pegmatite District, Mesoproterozoic, ~1.430-1.474 GaLocality: 3A Road roadcut north of Royal Gorge Bridge, west of Canon City, south-central Colorado, USA |
| 撮影日 | 2014-08-22 16:59:53 |
| 撮影者 | James St. John |
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