These stones are a very distinct form of rhyolite with agate inclusions. From the appearance, they would appear to be only somewhat related to thunderegg nodules, though still close enough to include here.
Beautiful Emirler Village Rhyolite Transitional Nodule with Amethyst
Emirler Village Rhyolite Transitional Nodule with Pale Agate
Emirler Village Rhyolite Transitional Nodule with Lively Agate
Emirler Village Rhyolite with a Large Agate Pocket
Complex Emirler Village Rhyolite Transitional Nodule