Yes, 15 lb black felt is used as an underlayment for asphalt shingles and the same laying dimensions apply. Mineral felt is a 30, 40 or even 90 lb felt that is layered with small gravel on the surface and comes in various colors, and is “hot mopped” or torched on.
See here for example Heavy Duty Green Mineral Shed Roofing Felt- 40kg | Felt Products
I have used the 15 lb underlayment felt to replicate asphalt shingles on some of my building roofs, but over time in the sun the oils have a tendency to dry and the material begins to curl on the edges.
Here is a picture of a roof I did about 3 years ago
Just as an after thought here is a picture of my sawmill building roof where I used 30lb mineral felt as a roofing.