Nano-structure of the cristobalite and tridymite stacking sequences in the common purple opal from the Gevrekseydi deposit, Seyitömer-Kütahya, Turkey
作者: Murat HatipoğluYaşar KibiciGürsel YanıkCafer Özkul Yasemin Yardımcı
刊名: Oriental Journal of Chemistry, 2015, Vol.31 (1)
来源数据库: Material Science Research India
DOI: 10.13005/ojc/310104
关键词: Gevrekseydi common purple opalsXRDOpal-CTKütahya-Turkey
原始语种摘要: The strata that include the fine purple opal formations examined in this paper from the magmagenetic hydrothermal dis solutions. The opals are locally known as Gevrekseydi purple opals. These opal-bearing strata are deposited in volcanic lavas and tuffs in the Seyitömer-Kütahya region of western Turkey. The purple opals are common-type and attractive gem-quality, and they are sold on the worldwide gem markets. We conducted mineralogical investigations to clarify their silica building components, measure their nano-size, and determine their origins. The opals are an opal-CT (opal-cristobalite/tridymite)- type silica polymorph with the variable number of cristobalite and tridymite layers. The cristobalite and tridymite stacking sequences were evaluated in terms of maturation, crystallite...
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  • tridymite 鳞石英
  • cristobalite 方石英
  • crystallite 雏晶
  • common 普通
  • purple 紫色的
  • diffraction 衍射
  • deposit 沉积
  • silica 硅土
  • structure 构造
  • hydrothermal 热液的