標 本 名: | 長石 グループ, 斜長石, 曹長石 (Albite)
| 化学組成: | NaAlSi3O8 | サ イ ズ: | | 重量: | | 透明: | | 数量: | | 産地: | Sakangyi area, west of Mogok, Shan State, ビルマ(ミャンマー) Burma (Myanmar) | Here you get a very rare & gemmy plagioclase crystal, normally gemmy orthoclase crystals can be found, in this case you can see distinctive (albite) twin lamellae, and therefore it can't be an orthoclase. The specimen shows at the shortest prism face a fracture plane, but the head as well all other sites, include the angular base is fully crystallized or recrystallized. Plagioclase crystals in gem quality are very rare.
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