We had gone camping at Calico Ghost Town,for Calico days in the Mohave desert, CA, I believe it was Sept. 1973. ( I am sure about the year, just not the month) that night Mike, Sandy, Laura, and my self slept out side, we were making out with the girls when Mike stood up and asked "what's that ?" the time was approx. 2 am, I rolled over and saw what I thought was the moon shining through a weather balloon and told mike "It's just a weather balloon." and rolled over back to Sandy when Mike said, "That isn't a balloon." when I rolled over onto my back I could now see a large triangular craft approx. 300 ft. across, and approx. 300 ft. off the ground slowly moving over the top of us. What I thought was the moon shining through a balloon now looked more like an observation bubble under the nose of the craft, and it was glowing a dull light purple in color. As it moved over it made no sound, and I saw no lights, but as it cleared the moon you could see the light reflect off the craft and it gave it the color of gun metal blue, and the edges appeared to be rounded. It continued its slow moving progress away from us following the hills of the desert, and flying just above hill top level. Mike and I then got up and started putting on our shoes while the girls begged us not to follow fearing something was going to happen to us. So we followed running up hills, then down one and up another, but the craft got further away each time so we stopped and just watched. I saw no sign of an engine, and we heard no sounds. Had it not been for the fact it flew right over the top of us we would never even had known it was there. My feeling was that the craft was running in stealth mode, no lights and at very low levels to avoid detection. What struck me so odd, was back then it was supposed to be fast moving shinny disk shaped objects, like in "Chariots of the Gods" I did not see anything like what we saw until I watched a program on TV describing the same thing I saw, except ours did not have any of the lights mentioned.