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While examining a freshly broken sample of silica-poor igneous rock, the geologist noticed tiny inclusions of nepheline that were already starting to weather.
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While examining a freshly broken sample of silica-poor igneous rock, the geologist noticed tiny inclusions of nepheline that were already starting to weather.
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Related words
nepheline
Noun
countable
uncountable
(mineralogy)
A
feldspathoid
mineral
of
silica-poor
igneous,
plutonic
and
volcanic
rocks.
Chemically,
nepheline
is
a
plagioclase
feldspar
with
insufficient
silica
to
satisfy
the
chemical
bonds.
Because
of
the
unfilled
bonds,
nepheline
weathers
rapidly
and
can
only
be
seen
as
inclusions
in
freshly
broken
rock.
Japanese Meaning
(鉱物学) シリカ不足の火成岩、深成岩、火山岩に見られるフェルドソイド鉱物。化学的には、シリカが十分でないためプラジオクラースフェルドスパーとみなされ、未充填の結合により風化しやすく、新鮮に砕かれた岩石内に含まれることが多い。
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