a 
=—_ 
Volcanic Eruptions on Hawaii. 361 
The lava of the eruption is remarkable for the large proportion 
of chrysolite, amounting in some parts to nearly one half, and oc- 
curring in coarse grains often a fourth of an inch thick. It is 
Consequently very brittle, slabs being easily shattered to pieces 
y a tap of the hammer. the seashore produced 
by the eruption, consist largely of this mineral mixed with black 
grains of the comminuted lavas. In the abundance of chrysolite 
river. ‘Thus three “Monte Nuovos” instead of one were thrown 
up at a single eruption. ‘The yellow color of the tufa is owing 
to the action of the steam and water on the ferruginous cinders, 
teducing some part of the iron to a hydrate. 
Since leaving the Sandwich Islands, I learn from the Rev. Mr. 
Coan that the crater has again been gradually filling up. In No- 
vember, 1841, there was little action except in the great lake. In 
Sxconp Szrres, Vol. [X, No. 27.—May, 1850. 
