Larvikite comes from the same family as feldspar and labradorite hence the shimmer.
It's a stone that will clear any negative energy and rid you of things that no longer serve you.  If used during meditation it can still and focus your mind, it also enhances your connection to nature and is very grounding.
This beautiful piece has been wrapped in copper to enhance the properties.  It comes with free uk postage, a free cord necklace, free gift wrapping and is just £35