Beaches in Marmaris

Hi,
I am thinking of going to marmaris in July but dont know what the beaches are like. Can someone advise me of what they are like. Ive heard mixed reviews but someone said the sand is black!?!!?
Thanks Emily
I am thinking of going to marmaris in July but dont know what the beaches are like. Can someone advise me of what they are like. Ive heard mixed reviews but someone said the sand is black!?!!?
Thanks Emily