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Beryllium
Beryllium
is a
chemical element
with symbol
Be
and
atomic number
4. It is created through
stellar nucleosynthesis
and is a relatively rare element in the
universe
. It is a
divalent
element which occurs naturally only in combination with other elements in minerals. Notable
gemstones
which contain beryllium include
beryl
(
aquamarine
,
emerald
) and
chrysoberyl
. As a free
element
it is a steel-gray, strong, lightweight and brittle
alkaline earth metal
.
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