I'm not sure that cluster is quite the right word for this great piece of lithium quartz, it looks like it was probably independently formed rather than snapping off something else which I think makes it more special!
It has lovely flat windows on the back and interesting points on the front and the tell tale purpley grey layer of lithium on it's top.
It measures about 7.2cm x 4.2cm x 2.9cm.
Please check the size before you buy Lithium Quartz is more expensive and rare than normal quartz.
This piece has a couple of raw patches on it.