ビルマ、タイ、ベトナムのペグマタイト鉱床では極めて良質のルビーとサファイアが産出される。カンボジアにアンコールワットを創出し、今は消えてしまったクメール人が知らなかったはずはない。
宝石の宝庫、ゴンドワナ大陸？分裂の境界で興味深い宝石類が取れる。日本には宝石は殆ど産出しませんね。
asahi-net.or.jp/~up5s-andu/SUISHO/02_shinka2
Essex, Connecticut近郊のペグマタイト岩脈
epod.usra.edu/blog/2010/04/pegmatite-dike
The photo above shows an attention-getting pegmatite dike near Essex, Connecticut. Pegmatites are igneous deposits that commonly contain large crystals and rather uncommon minerals.
Numerous dikes can be found intruding into the metamorphic rock mass that took shape during the compression phase of the ancient Pangaea supercontinent's formation.
After the breakup of Pangaea, approximately 200 million years ago, there were a number of episodes of igneous intrusions into the metamorphic mass.
Today, all along the Route 9 North highway many repeating diagonal dikes are clearly visible. Photo taken on April 5, 2010.
Photo details: Camera: NIKON E5900; Image Date: 2010:04:05 13:10:12; Focal Length: 7.8mm (35mm equivalent: 38mm); Aperture: f/4.8; Exposure Time: 0.0027 s (1/374); ISO equiv: 64
livescience.com/37285-gondwana
pegmatite.ru/My_Collection/pgm
edmar-co.com/adriano/field/Pala/pala2006