marble
ps: this is kind of cool: The Arni marble quarry where that picture above was taken is on a mountaintop in Italy and from all the marble dust collecting and washing down from the mountain top over the centuries, there is a "glacier of marble dust". The quarry is at the 5000-foot peak of Mt. Altissima, the same mountain from which many of Michelangelo's blocks of marble were extracted.
The quarry sits at the peak of Mt. Altissima. Over the centuries since the quarries began, the marble dust has flowed down and whitened the mountainside.
