標 本 名: | エルバイト(トルマリン) インディゴライト (Indicolite) / クウォーツ (Quartz)
| 化学組成: | Na(Li1,5AL1,5)Al6(BO3)3[Si6O18](OH)3(OH) / SiO2 | サ イ ズ: | 81,9 x 68,4 x 13,6
クリスタル: 50,9 mm | 重量: | | 透明: | | 数量: | | 産地: | Darra-i-Pech (Pech; Peech; Darra-e-Pech) Pegmatite Field, Nangarhar (Ningarhar) Province, アフガニスタン (Afghanistan) | Blue-green ,bicolored Tourmaline crystals attached to a very unusual flat quartz! The Tourmaline crystals are doubly terminated and the quartz displays only a small area with fracture planes at the thinner lateral part. The front of the quartz display a marvelous luster with typical growth pattern, the backside is covered with a thin layer of feldspar. Very interesting and unusual specimen from Afghanistan.
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