Chinese Version(中文版)
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EBooks(电子书)
Opals
[əʊplz]
Examples
Silica
is
also
met
with
in
the
carnelian
and
we
find
it
constituting
jasper
,
agate
,
cat
’
s
-
eye
,
onyx
and
opals
.
Various.
The Wonder Book of Knowledge
.
Editor: Vince