On-line Dictionary
Pearlstone
Pearlstone
n.
A
glassy
volcanic
rock
of a
grayish
color
and
pearly
luster
,
often
having
a
spherulitic
concretionary
structure
due
to
the
curved
cracks
produced
by
contraction
in
cooling
.
See
Illust
.
under
Perlitic
.
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