I think I've posted about this idea here before. I made a small piece of it today and thought I would post up the results.
In all I ended up a fairly strong piece. I made a 2in Dia x 1in disk by using a waxed paper cup and some loctite Metal and Asphalt 5 minute epoxy. I'll let it cure for a day or so before I start smacking it around. But so far it is amazingly hard. even though I only used pea stone instead of the quartz.
In order for me to go forward though I am going to have to find a suppier for maybe a gallon of metal filled eopxy and hardener. I will also need a cure extender and something to lower the viscosity. A shaker table and vacuum pump wouldn't hurt either.
Anyone know any good sources for this stuff? Loctite seems like they might be a bit pricey for the epoxy supplies. Also once I get the formulation and casting quantified a bit more, would anyone be interested in bases cast out of it?