How do I identify fire bricks fro normal ones?

[sonomacast]

Somebody has some bricks for sale and they think that they are fire bricks but are not so sure. How can we get a posotive ID on them? Thank you

[CanuckJim]

The best thing for you to do is take one to your local masonry supplier and ask for verification.

Jim

[james]

Agreed.
For a little more background info, you can look here:

http://fornobravo.com/pompeii_oven/brick_primer.html

James