Cathodoluminescence (CL) features of the Anatolian agates, hydrothermally deposited in different volcanic hosts from Turkey

► Two different types of multi-colored gem-quality agate samples were investigated. They are both found in the same area in the Çubuk-Ankara region of Turkey. ► A combined study of X-ray diffraction (XRD), chemical analyses (XRF and ICP-AES), and cathodoluminescence (CL). ► Cathodoluminescence results at room temperature were obtained using measurements with alternating current (AC) (at energies of 14 and 24 keV) as well as direct current (DC) (at 14 keV energy), and they display remarkably different patterns between the two types of agates. ► Genesis and characterization.