Stone question

[Links Shadow]

The top 3 images look a little bit like polished petrified wood but it is difficult to tell.

[kakkarot]

have you been to a jeweler? they might have better luck and info

~kakkarot

[m0d0]

I recognise that stone, i have one.

I dont know what it is called but i may know someone that does.

I do know that i got the Stone from South Africa. I was told theres a cave you go to and you pay to enter. Your then given a cup, when you walk into the cave the floors are covered with these stones all different sizes, shapes, and colours. You fill your cup and leave.

I'll let you know when i find out

[Blackbird]

(I'm not entirely certain if this is the right place for this, but I've looked through all the other sections, and it seemed to fit here best. Sorry if it's mis-placed.)

I was given a necklace with various stones on it - jade, quartz et cetera. And I know what most of them are - except for one. Now, I've looked all over the place, and thus far I haven't been able to find out what this thing is. The person that gave it to me doesn't know what it is either.
Here's a link to a scan of it, and close-ups of the stones in question:
http://img9.photobucket.com/albums/v27/amsel/stones.jpg

Does anyone here know what it's called? I seriously have no idea.