Polishing of their Walls or "Slicken sides."
"The Student's Elements of Geology"
Sir Charles Lyell
The two faces in contact are Slicken-sides, well polished and fluted, and sometimes covered by a thin coating of lead-ore.
"The Student's Elements of Geology"
Sir Charles Lyell
Slicken-sides, in opposite walls of veins.
"The Student's Elements of Geology"
Sir Charles Lyell