浙江青田石的宝石学研究

Gemmological Study on Qingtian Stone from Zhejiang Province

  • 摘要: 浙江青田蓝花钉、蓝花星、紫罗兰、山炮绿属青田石中的新品种。根据其化学成分、矿物成分及其共生组合特征,初步确定蓝花钉为刚玉-叶蜡石型;蓝花星和紫罗兰为蓝线石、红柱石-叶蜡石型;山炮绿为铬云母-石英型。研究表明,蓝花星主要由富铁蓝线石组成;紫色花星由贫铁蓝线石和红柱石组成;部分蓝花钉由微晶刚玉组成;山炮绿中的主要矿物为铬云母,次要矿物为石英,含少量黄铁矿、红柱石、伊利石等矿物,因其质地细腻而成为青田雕刻石的又一新品种。

     

    Abstract: Lanhuading, Lanhuaxing, Ziluolan and Shanpaolü, the typical varieties of Qingtian Stone,are studied on their mineral compositions and mineral association by electron microprobe analysis, X-ray powder diffraction analysis, infrared absorption spectroscopy and so on. The following conclusions are drawn: First, the classification of Qingtian Stone from Zhejiang Province based on its mineral association characters shows that Lanhuading belongs to the corundum pyrophyllite type; Lanhuaxing and Ziluolan belong to the dumortierite and alusite pyrophyllite type; and Shanpaolü is mainly composed of mica, not belonging to the pyrophyllite type. Second, the dumortierite-andalusite-pyrophyllite type Qingtian Stone (Lanhuaxing and Ziluolan) has complex mineral association: the yellow matrix is mainly composed of pyrophyllite with a little illite, quartz and other minerals; the blue or purple part in the stone is dumortierite; the light white and rosy spots is andalusite; the achromatic and transparent spot is dickite; and the blue part in corundum pyrophyllite type is composed of microcrystaline corundum. And finally, it is stressed that Shanpaolü is not composed of pyrophyllite at all. Its main mineral is mica, with a little quartz, pyrite, andalusite, illite and so on. Therefore, it should be a new variety of caved stone. Its vivid green is caused by Cr.

     

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