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单词 synneusis
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synneusis
synneusis n.
Brit. /sᵻˈnjuːsɪs/
,
U.S. /səˈn(j)usəs/
[Greek νεῦσις swimming] Geology the clustering together of crystals of a mineral in a rock; frequently attributive in synneusis texture.
ΘΚΠ
the world > the earth > minerals > mineral structure or appearance > [noun] > crystal structure > clustering
synneusis1921
1921 J. H. L. Vogt in Jrnl. Geol. (Chicago) 29 321 The individuals of a mineral, segregated from a magma at an early stage, frequently swam together to assemblings or aggregates, the result of which is a structure, for which I propose the term together-swimming structure or synneusis structure.
1959 W. W. Moorhouse Study of Rocks in Thin Section xi. 241 Probably related to the banded character of the basic complexes is a texture, sometimes called ‘synneusis’ texture, in which the dark minerals..tend to occur as lenticular clumps or aggregates.
1967 Amer. Mineralogist 52 529 The preferential character of synneusis for several common individual minerals and mineral pairs.
1973 J. T. Renouf tr. Didier Granites & their Enclaves xiv. 368 When two rocks contain the same volumetric percentage of phenocrysts, synneusis is greatest in that with the smaller crystals and thus with the greatest number.
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