Last Updated
：2025/11/20
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。
Sense（1）
(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.
（ plural ）
Quizzes for review
(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.
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See correct answer
nepheline
While examining a freshly broken sample of silica-poor igneous rock, the geologist noticed tiny inclusions of nepheline that were already starting to weather.
See correct answer
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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