This is regular Pennsylvania flagstone. Able to purchase at pretty much any place that sells natural outdoor stone products. A google search turns up a few good results. Keep in mind though that it is a natural product and the color ranges vary greatly depending on what quarry and where in the quarries the stones and mined from. My employees hand pick the stone from multiple pallets to create the best color mixture with what's available and what the individual request is.

It is mortar. There are quite a few different types. None of which we use are white in color but more often a tan or gray. All mortars will appear bright when first installed. This one will fade out fairly quickly and has to better compliment the stone with a darker more natural hue. Its is the same mortar that is used for the wall and that too will fade but because it is vertical work it is not subjected quite a badly to the elements so it will not transition as quickly.