Note 21 — Chapter VII · CENTRAL CHILE:—STRUCTURE OF THE CORDILLERA.
Reading edition
Very easily fusible into a jet-black bead, attracted by the magnet: the crystals are too much tarnished to be measured by the goniometer.
Reading edition
Very easily fusible into a jet-black bead, attracted by the magnet: the crystals are too much tarnished to be measured by the goniometer.