Gemmological Characteristics and Classification of“Taishunshi”as Pyrophyllite-type Seal Stone from Zhejiang Province
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摘要: 采用宝石显微镜、扫描电子显微镜、X射线粉末衍射仪和X射线荧光仪等仪器测试方法对浙江泰顺石的宝石特征和分类进行研究。研究表明，泰顺石为典型的叶蜡石型印章石，较青田石含有更多的硬水铝石和明矾石。泰顺石的结构越均一，其透明度越高；片状晶形越发育，蜡状光泽越强；因不同矿物的冷凝点与叶蜡石不同，形成各种纹理。Al元素质量分数增加会一定程度上抑制Si、Fe和Ti等元素的质量分数增加，从而逐步改变泰顺石的品质。根据主量元素的质量分数，“泰顺石”可分类为纯叶蜡石型、高铝叶蜡石型、高硅叶蜡石型、高铁叶蜡石型和高硫叶蜡石型等，以标型次要矿物作为分类划分的初步方法，宝石级泰顺石多数属于高铝叶蜡石型。Abstract: Microscope,SEM,XRD and XRF are used to study the gemmological characteristics and classification of"Taishunshi"from Zhejiang Province.The results show that the"Taishunshi"samples are typical pyrophyllite seal stones,which contain more diaspore and alunite than Qingtian stone.In the observation the transparent samples has the uniform structure,and with good lamellar structure it shows a strong waxy luster.The different minerals have different condensation point from that of pyrophyllite,which led to various textures.In the study it shows with the increasing content of Al element,the contents of Si,Fe and Ti reduce,which affect the quality.According to the contents of major elements,the authors think that"Taishunshi"can be classified to pure-pyrophyllite type,high-aluminum pyrophyllite type,high-silicon pyrophyllite type,high-iron pyrophyllite type and high-sulfur pyrophyllite type.Most of high quality"Taishunshi"samples belong to the high-aluminum pyrophyllite type.
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Keywords:
- “Taishunshi” /
- seal stone /
- classification /
- pyrophyllite /
- Qingtian stone /
- Shoushan stone
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