Note 255 — MINERALS. (continued 2)
Reading edition
GNEISS is a primitive rock, consisting, like granite, of felspar (110), quartz (76), and mica (123), but differing from that rock in its structure, being slaty.
Reading edition
GNEISS is a primitive rock, consisting, like granite, of felspar (110), quartz (76), and mica (123), but differing from that rock in its structure, being slaty.