I Climbed up Jebel Hafeet (a mountain in the UAE) a couple months ago and I found these 6 crystals. I believe 3 are the same and the other 3 are completely different. They all don't seem to have a shape, they seem to grow randomly. I can't figure out what they are. All six of them are bellow a mohs hardness of 5, because they can't scratch glass. The 3 tan ones are opaque, but a little light shines through, and are rough to touch. The 2 brown ones are completely opaque, and are strong. And the white one is clear and fractures easily. I will appreciate anyone that can give me an answer. I can e-mail the pictures to who ever is willing to check them out.