Larvikite. What do they do?

I just won myself a Larvikite bracelet from a contest.

The person who initiated the contest told me that I manifested the larvikite into my life because I somehow need it.

So for those who know, what exactly does Larvikite do? What are they for?

A quick Google gives a ton of content, though not personal experience as I assume you want.

Anyway, a place to start, with pictures:

http://www.ehow.com/info_8306656_metaphysical-properties-larvikite.html