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单词 feldspar
释义
feldspar
noun[CorU]
geologyspecialized
uk
/ˈfeld.spɑːr/us
/ˈfeld.spɑːr/
acommontypeofmineralfoundespeciallyinigneousrockssuch asgranite
长石（一种常见矿石，尤见于火成岩，例如花岗岩中）
SMART Vocabulary: related words and phrases
Geology: types of rock
  • arenaceous
  • arenite
  • asthenosphere
  • asthenospheric
  • basaltic
  • borax
  • chalk
  • emery
  • flint
  • lahar
  • limestone
  • lodestone
  • magma
  • marcasite
  • marl
  • marmoreal
  • metamorphic
  • pumice
  • pumice stone
  • soapstone
See more results »
(Definition offeldsparfrom theCambridge Advanced Learner's Dictionary & Thesaurus© Cambridge University Press)
Examples from literature
  • It contains a large proportion of mica, a small proportion of quartz and still less feldspar, but generally an abundance of iron pyrites in very minute crystals, which, on exposure, are decomposed.
  • It is the metallic base of mica, feldspar, slate, and clay.
  • It was made of black, glassy lava mixed with bits of feldspar.
  • The purest clay found in nature is porcelain clay, or kaolin, which results from the decomposition of a rock composed of feldspar and quartz, and it is almost always mixed with quartz.
  • What little feldspar there was is reduced to quartz and mica, and the quartz pebbles are drawn out into lenses.

Examplesoffeldspar

feldspar
This is conspicuous for biotite and amphibole crystals but less so in the strongly alteredfeldsparcrystals.
From theCambridge English Corpus
In these first five zones, some crystals, mainly feldspars, are visible in hand specimen.
From theCambridge English Corpus
The presence of quartz-filled microcracks infeldsparcrystals suggests that deformation continued during cooling and crystallization.
From theCambridge English Corpus
Such spidergrams strongly suggest that these metafelsites solidified from highly fractionated melts, which underwent extensive, low pressure, accessory phases- andfeldspar-dominated crystal fractionation.
From theCambridge English Corpus
It is a medium-grained, foliated orthogneiss with smallfeldspar'augen'.
From theCambridge English Corpus
Somefeldspargrains, however, show weakly developed asymmetric strain shadows (-type).
From theCambridge English Corpus
The magnetic fraction of the surface sand contains pyroxene andfeldspargrains as in the bulk material, but little quartz.
From theCambridge English Corpus
The two planes intersect along cd which is the locus of liquids in equilibrium with a silica polymorph + two feldspars + aqueous fluid.
From theCambridge English Corpus
The matrix is composed of finegrained recrystallizedfeldspar.
From theCambridge English Corpus
Feldsparporphyroclasts have been rotated during shearing and folding.
From theCambridge English Corpus
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
#https://dictionary.cambridge.org//dictionary/english/feldspar##
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更新时间：2025/9/26 18:08:18