[MR] Cutting soapstone into slabs

[Gorm of Berra]

Unto those assembled does Gorm of Berra, frustrated caster, send greetings...

I am in possession of two large bricks of soapstone (3"x3"x6" each) which I 
wish to subdivide down into 20ish 3"x3"x1/2" slabs for carving and casting.

The problem is that I do not seem to posses the right tools for this job.

This can be solved with a simple application of money, obviously, but the 
question is...what *is* the right tool for the job?

I have a coping saw...but I couldn't cope with it (dulled blades way fast, 
and tough to cut a straight line).

I'm not opposed to power tools...in fact I rather like them.  The question 
is, what power tool to use?

Alternatively, what manual tool will assist me in cutting a reasonably 
accurately square slab without an overabundance of effort?

Gorm