Note 9 — Chapter VII · AUSTRALIA; NEW ZEALAND; CAPE OF GOOD HOPE.
Reading edition
Chlorophæite, described by Dr. MacCulloch (“Western Islands,” vol. i, p. 504) as occurring in a basaltic amygdaloid, differs from this substance, in remaining unchanged before the blowpipe, and in blackening from exposure to the air. May we suppose that olivine, in undergoing the remarkable change described at St. Jago, passes through several states?