Obsidian
Description
A block of shiny black obsidian. It has a glassy appearance.
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Object detail
Classification
Credit line
Obsidian
is
a
naturally
occurring
volcanic
glass.
It
is
a
form
of
Rhyolite.
It
is
formed
when
the
erupting
lava
cools
rapidly
and
does
not
have
many
gas
bubbles.
Accession number
A100.850
Collection type
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