This material is part of the Iceland biome in the Signature Series I created for Allegorithmic.

The goal was for each Substance material to be diverse and customizable in order to highlight the true power of Substance Designer over other static media formats. To give the end user more control, I added tweakable parameters. The parameters I enabled are inspired by what would naturally occur in nature, such as melting snow, moss growth, rising water levels, etc.

https://www.allegorithmic.com/blog/substance-source-signature-materials-daniel-thiger