高折射率电气石的鉴定

详细信息

Identification of A Tourmaline with High Refractive Index

1. Gemmological Testing Center of Shandong Province, Ji'nan, 250014, China;
2. Institute of Mineral Deposits and Resources, Chinese Academy of Geosciences, Beijing, 100037, China

摘要: 宝石级电气石的折射率N_o为1.635~1.663,N_e为1.610~1.630,高于此值的宝石级电气石较少见。对一粒折射率值为1.640~1.672的电气石进行了系统研究,证实了铁质量分数高是导致电气石折射率值高的原因。
- 高折射率 /
- 电气石 /
- 鉴定
Abstract: The refractive index of gem-quality tourmaline is usually 1.635~1.663 (N _o) and 1.610~1.630 (N _e), and the tourmaline whose refractive index is larger than 1.663 (N _o) and 1.630 (N _e) is rarely seen in market. In this paper, a tourmaline, whose refractive index is 1.640~1.672, has been studied to prove that the high content of iron is the cause of its high refractive index.
- high refractive index /
- tourmaline /
- identification