I created a encryption key-pair in Enigmail, but I can't see it when I do `gpg --list-keys` in terminal

I installed the Enigmail mail encryption plugin for Thunderbird and created a key-pair as the installation wizard instructed me. I can send and encrypt/decrypt mail with this key. However, when I want to list my keys in the terminal using gpg --list-keys I get no output what so ever. Why?