Basalt is made for signage.
In a single font there are capitals in wide and narrow versions as well as a set of compatible arrows.
Basalt was first used for signage at the Cecil H. Green Library, Stanford University.
Tuff began with Magma. Set as text, they appear to be similar and are quite comfortable as typographic companions. The child-safe softness of Tuff owes something to the letterforms of the earliest extant Greek Manuscript, The Persae by Timotheos in the 4th Century BC. It is beholden to Morris Fuller Benton's original Souvenir, and its revival by Ed Benguiat. My own Stone Informal was also an influence.