I think you have two options: 1: Transfer to a Google Account login to a Google account on your Blackberry and go to the
contacts app > gear icon > General > Contacts Management > Copy Contacts and you will be able to copy them straight to the Google account. Then login on your Galaxy S6 and enable contacts sync.
2: Export as a vCard or .vcf file
contacts app > gear icon > General > Contacts Management > Import/export and select an option. Then transfer the file from your Blackberry to your S6, and go into the contacts app and click import.
If in option one, for whatever reason you are not able to login to a Google account and transfer the contacts, you can export them as a vCard or .vcf, and import them into Google contacts on your PC directly.