Agate formation in the Pliocene conglomerates is found as nodules in the central western part of Anatolia and is unique in terms of sepiolite replacement. Therefore, the geology, mineralogy, and genesis of agate nodules in polymictic conglomerates from Yazlıca in the Kütahya region are presented in this study. Furthermore, the properties of Yazlıca agate are compared to Dereyalak agate formed in Pliocene conglomerates from the Eskişehir region. Yazlıca agate nodules are formed from three to 30 cm in diameter and have mainly four different colors with a zoned appearance. XRD analyses show that chalcedony is the main silica mineral constituting agates in this region. The existence of sepiolite in agates was detected using XRD analysis in this research. DTA analysis also confirmed endothermic peaks at approximately 724°C and 737°C followed by exothermic peaks at approximately 800°C and 830°C, further indicating that sepiolite exists in Yazlıca agates. Dereyalak dendritic agate nodules were formed in the same period (Pliocene) so the Yazlıca agate formation was compared to the Dereyalak agate formation. This research concluded that both agate occurrences were formed through sepiolite replacement via low-temperature, silica-rich hydrothermal solutions within fracture systems.

在安那托利亚中部西部发现上新世砾岩中的玛瑙形成为结核，就海泡石替代而言是独特的。因此，本研究介绍了库塔赫亚地区亚兹利亚的多聚砾岩中的玛瑙结核的地质，矿物学和成因。此外，将Yazlıca玛瑙的特性与在Eskişehir地区的上新世砾岩中形成的Dereyalak玛瑙进行了比较。Yazlıca玛瑙小瘤的直径为3到30 cm，主要具有四种不同的颜色，并具有分区外观。XRD分析表明，玉髓是该区域构成玛瑙的主要二氧化硅矿物。本研究中使用XRD分析检测了玛瑙中海泡石的存在。DTA分析还确认了大约724°C和737°C的吸热峰，接着是大约800°C和830°C的放热峰，进一步表明海泡石存在于Yazlıca玛瑙中。Dereyalak树突状玛瑙结节是在同一时期形成的（上新世），因此将Yazlıca玛瑙形成与Dereyalak玛瑙形成进行了比较。这项研究得出的结论是，两次玛瑙的形成都是通过海泡石的替代，是通过裂缝系统内的低温，富含二氧化硅的水热溶液进行的。