I know the meaning behind the piles of white rocks at Bruce Bay (West coast; between Haast and Fox Glacier) has been discussed on here before but I'm more interested in specifically what type of rocks they are.
For those unfamiliar, the rocks are white, very smooth, slightly translucent and seem to have very small crystals in them (I think quartz?) that glisten in the sun. The rocks are plentiful at Bruce Bay. I'm afraid I don't have a picture but a quick google of 'white rocks Bruce bay' should show you what I'm talking about.
If anyone has an idea of what they are (or can point me in the direction of a geologist!) I'd be very grateful.