If A minor doesn't have any accidentals, is it still minor?

Question

As part of a music course, we have to compose a 3 minute long piece based on a river's journey. Having finished the composition, we now have to write a set of sleeve notes - basically an analysis and commentary of our individual piece. This is going to seem really stupid, but my situation is this: My piece sounds as though it is in A minor, but there is no G sharp accidental at all in the music, only G naturals (although they are rare in my piece). Does this mean that it is in C major? (There are no other sharps or flats) Or can I say it is in A minor?

Answer 1

You can say it's in A natural minor (or A Aeolian mode). That's what it's called when you're using just the white key notes, but A is the tonic.