Note 390 — Chapter XLVI · TYPES OF STRUCTURE IN THE ACID ROCKS—BOSSES
Reading edition
The difference of contour and colour between the ordinary reddish smooth-sloped "syenite" and the black craggy "hypersthene rock" and "greenstone" in the Glamaig group of hills caught the eyes of Von Oeynhausen and Von Dechen (Karsten's Archiv, i. p. 83).