This could be Utah Red Botryoidal Grape Agate. (See my blog, "The Grapes of Sandra Fell"). I have never seen a piece this big before and it looks more like a seam agate. But the red botryoidal 'warts' on the bottom are right and the colors are right too. The last thing I want is to misidentify a rock.
 
It's just the right size for a rock saw. You can slice it like cold cuts for lapidary work. But you might not want to do that because about half of the top is a layer of beautiful quartz crystals. It would look great as a display specimen too.
 
Botryoidal agate is characterized by its clustered, rounded formations resembling a bunch of grapes or small bubbles. Botryoidal agate forms when layers of silica-rich fluids deposit successive layers of chalcedony around a central nucleus, creating these distinctive rounded shapes.
 
If you're interested in more rocks, you can save a few dollars by combining several items into the same custom order.  There will be just one shipping charge in a cost-effective USPS flat rate padded envelope. Send a message before ordering so we can set up the order. I do a lot of my business through custom orders and I love to work with people to get just the right rocks you're looking for.