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自然界中绿柱石晶体多为柱状,具板状晶形的绿柱石非常少见。本文对产于四川雪宝顶云英岩晶洞中的无色透明板状绿柱石进行了精确的结构分析,并与产于阿尔泰三号伟晶岩脉中的柱状绿柱石进行了比较。与阿尔泰柱状绿柱石相比,雪宝顶板状绿柱石富Li、Na,c/a值较高,为1.001,属钠-锂绿柱石或“四面体”绿柱石。本文还对这种特殊形貌绿柱石的形成机制进行了初步讨论,成矿流体中Li的浓度以及Si的化学形态可能是影响绿柱石形貌的重要因素。
Most of beryl crystals in nature are columnar, beryllium with plate crystal is very rare. In this paper, the accurate structural analysis of colorless and transparent plate-shaped beryl from the beryl rock in Xuebaoding, Sichuan Province is carried out and compared with the columnar beryl produced in the Altay III pegmatite vein. Compared with the Altai columnar beryl, the Xuebaopian plagioclase rich Li, Na, c / a value is 1.001, which is a sodium-lithium or tetrahedrite. This paper also discussed the formation mechanism of the beryl beryllium. The concentration of Li in the ore-forming fluid and the chemical form of Si may be important factors that affect the beryl morphology.