Rock Plant?

Description:

I have had this plant for a couple of years and this summer it has bloomed with these lovely little white flowers. I don't know how often she will bloom, but I wish I could find another one. I'm afraid to separate it, although it is still in it's plastic pot from when I bought it at Lowe's. I love her. I do not know where they originate. Is it called a rock plant or something like that?