Ptarmigan is Colorado quarried grey gneiss with hints of white and green. This is a very high density and strong stone. Ptarmigan Mosaic thin veneer allows you to bring the concept of a historic “rubble rock” wall into your project without the weight and cost of a full rock wall.
Ptarmigan Mosaic Information Card PDFDesigning with Thin Veneer
The RMMI does not recommend dry stacking thin veneer in Colorado in outdoor conditions.
Natural Stone Institute
Rocky Mountain Masonry Institute