Chalcedony. A semi-treasured gemstone named after the nearby city of Chalcedon, and is particularly marketed in many of Istanbul's large number of jewellery shops. Today, most metro stations do not have a staffed ticket booth, so you'll need to get hold of your Istanbulkart through the yellow ticket equipment. By https://wordpressinstallieren79090.blogsmine.com/37170047/detailed-notes-on-istanbul-wordpress