What type of rock is this?

Question

I found this rock in my backyard. I didn't really think anything of it except that it was clearly tumbled and I have no idea how it got in my backyard. It's about 2.25cm and is white/clear. A picture is below. Any ideas?

Answer 1

Believe it or not,  gravel when tumbled will produce the most amazing pretty rocks that you can imagine.  That rock is a quartz, very common river gravel, and nothing special compared to other gravel specimens.  Looks like something a kid lost, or playing with a sling shot.

Answer 2

Quartz.  It's very common.  Often you'll find pieces like that in landscaping rocks.

Answer 3

Looks like white quartz to me.  the kind of thing you find at most museums for kids.  It's been through a tumbler to smooth the outside. 

https://www.amazon.com/Fantasia-Materials-Polished...

Answer 4

Weathered glass, often found on beaches when ordinary glass is continually washed by waves.

Answer 5

It looks a lot like confuberite.