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Adjective
Describing
igneous
rocks
that
contain
magnesium
and
iron
and
only
a
very
small
amount
of
silica
,
such
as
are
found
in
the
Earth
’
s
mantle
.
Noun
A
rock
with
such
properties
.
Made with ♥ by Homo Sapiens on Planet Earth

Rejected by Y-Combinator. Definitions by Wiktionary.

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