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Yup. 1333 (aka PC10600) speed rated and you'll be fine.

It is not so simple.

In the Mac mini 2011 user guide, you can find the following part:

"Installing Memory

Your Mac mini has two memory slots in which you can install a pair of 1 GB, 2 GB, or 4 GB memory modules, for a maximum of 8 GB of memory. For best performance, don’t mix modules of different sizes; always install two identical memory modules.

Memory modules for your Mac mini must meet the following specifications:
- Small Outline Dual Inline Memory Module (SO-DIMM) format
- 1333 MHz, PC3-10600E, DDR3 compliant (also called DDR3 1333)
- Unbuffered and unregistered"

Don't pay the Apple price on it!

Right, but you should read the manual of your Mac mini, before you purchase new RAM. I recommend Kingston RAM. It is worldwide available, they have a good search function and their prices are very good for Apple compatible RAM.
 
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