This stone sure looks real but I don't know what it is, nor did the person at the store who sold it to me. But he said it was a stone of some kind. Maybe rutilated quartz, but then wouldn't it have needles in it? I bought it today in a crystal (mostly manmade crystal) jewellery store that had lots of genuine stone pendants, like turquoise, jasper and agate, for the same price. This stone is basically clear but has brown bits in it, it almost looks like little bits of brown algae from a lake.
I don't see any needles at all. I looked at it under a 10x loupe and I saw a few small bubbles that aren't visible to the naked eye. I also saw in one area that there were quite a few very, very tiny bubbles. There are also two tiny inclusions on the surface an a scratch on the bottom of it. Sorry for the poor quality photos, I can take more outside later when the light is better.