According to this information Feng Shui Use of Crystals it's rose quartz!

About offices ...

In the corporate world, every cubical is set-up so the computer is in the far corner which forces the worker to face INTO the cubical with their back to the door. I hated that. I also had a mirror next to my computer so I could see who was walking up behind me.

However, you're not supposed to have a mirror placed so you can see yourself working! Otherwise you will reflect that work and it will overtake your life.

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"I've been rich and I've been poor but independently wealthy is where it is at."