Help finding a saw blade to cut clay bricks

I need a saw blade (either for my circular saw or miter saw) that can cut clay bricks but am confused by the terminology surrounding them.

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I know I can buy a diamond blade, but those are expensive, so I'm trying to buy one of the black discs that can cut masonry.

I'm confused because most of those discs seem to be called "cutoff wheels," and many say they are for cutting metal. So, questions:

1. Is a "cutoff wheel" compatible with my saws as long as it is the right diameter? Or do I need to buy something that is labeled a "blade"?

2. Can I use a cutoff wheel for cutting bricks even if it says it is for metal?

3. Some of the cutoff wheels I'm seeing have different RPMs associated with them. Does that information matter for my purposes?

If there is something other than a cutoff wheel that I should be searching for, please advise.