Baltic Red Granite (rapakivi granite) (pyterlite) (Wiborg Batholith, 1.615-1.645 Ga, Paleoproterozoic; Pyterlahti Quarry, Kymi Province, southern Finland) : 無料・フリー素材/写真
Baltic Red Granite (rapakivi granite) (pyterlite) (Wiborg Batholith, 1.615-1.645 Ga, Paleoproterozoic; Pyterlahti Quarry, Kymi Province, southern Finland) / 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 | Baltic Red Granite - a rapakivi granite from southern Finland. This variety of rapakivi granite is called pyterlite. Pyterlite is characterized by having large K-feldspar spheroids that usually lack rims of greenish plagioclase feldspar. So, wiborgite has common plagioclase rims, and pyterlite commonly lacks plagioclase rims. The pyterlite sample shown here has one K-feldspar spheroid at the upper left with a greenish-brown plagioclase feldspar rim. Pyterlite is composed of reddish K-feldspar, greenish-brown plagioclase feldspar, dark-grayish quartz, and black biotite mica. This rock comes from the Wiborg Batholith (a.k.a. Wiborg Rapakivi Granite Batholith, Wiborg Massif, Vyborg Batholith) in the Baltic Shield (Fennoscandian Shield).Age: about 1.615 to 1.645 billion years, late Paleoproterozoic.Locality: Pyterlahti Quarry, near Virolahti, near the Russian border, far-southern Kymi Province, far-southern Finland (Baltic Red Granite is also produced from the Lypsyniemi Quarry). |
| 撮影日 | 2014-08-02 00:45:47 |
| 撮影者 | James St. John |
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