Note 12 — LETTER XXXII.
Reading edition
Lockhart, in the extract just below, calls them “milk-white.” This is exactly right of the pale bluish translucent quartz, in which the agatescent veins are just traceable, and no more, out of the trap rocks; but the gneissitic hills give also exquisitely brilliant pure white and cream-coloured quartz, rolled out of their vein stones. ↑