Word Finder - foliation

definition

The process of forming into a leaf or leaves.

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The process of forming into pages; pagination.

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The manner in which the young leaves are disposed within the bud.

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The act of beating a metal into a thin plate, leaf, foil, or lamina.

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The act of coating with an amalgam of tin foil and quicksilver, as in making looking-glasses.

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The enrichment of an opening by means of foils, arranged in trefoils, quatrefoils, etc.; also, one of the ornaments.

definition

The property, possessed by some crystalline rocks, of being divided into plates or layers, due to the cleavage structure of one of the constituents, as mica or hornblende. It may sometimes include slaty structure or cleavage, though the latter is usually independent of any mineral constituent, and transverse to the bedding, it having been produced by pressure.

definition

A set of submanifolds of a given manifold, each of which is of lower dimension than it, but which, taken together, are coextensive with it.

The development of foliation in shaly rocks is undoubtedly closely akin to the production of cleavage in slates.

The foliation is often parallel to the bedding, but may cross it obliquely or at right angles; or the bedding may be folded and contorted while the foliation maintains a nearly uniform orientation.

The difference between schists and gneisses is mainly that the latter have less highly developed foliation; they also, as a rule, are more coarse grained, and contain far more quartz and felspar, two minerals which rarely assume platy or acicular forms, and hence do not lead to the production of a fissile character in the rocks in which they are important constituents.

The varying texture of this rock, its irregular foliation and jointing, and its ramifying veins of pegmatite give it very unequal powers of resistance.

Calc-schists are usually argillaceous limestones in which a large development of biotite or phlogopite has occasioned foliation.

The phyllites (q.v.) form a middle term between this group and the slates; they consist usually of quartz, white mica and chlorite, and have much of the foliation and schistosity of the mica-schists.

When the foliation is undulose or sinuous the rocks are said to be crumpled, and have wavy splitting surfaces instead of nearly plane ones.

Any sudden decrease of warmth would be very prejudicial to the progress of vegetation through the successive stages of foliation, inflorescence and fructification.