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1
Amygdules are commonly
composed
of
silica
.
2
In silicious sponges the spicules are
composed
of
silica
,
and are generally deposited around axial rods in concentric layers.
3
Those that are
composed
of
silica
and soil are called "barrows" in high-flown language, while the simple heaps of stones are "gals-gals."
4
The analysis of lapis lazuli represented it to be
composed
of
silica
,
alumina, and soda, three colourless bodies, with sulphur and a trace of iron.