Sentence examples for a metamorphic from inspiring English sources

The concept was first defined in 1914 by a Finnish petrologist, Pentti Eelis Eskola, as any rock of a metamorphic formation that has attained chemical equilibrium through metamorphism at constant temperature and pressure conditions, with its mineral composition controlled only by the chemical composition.

It was "a metamorphic time," he recalled.

One day a beetle bursts into the sunshine, a metamorphic wonder, a miracle from muck.

The various mineral phases of a metamorphic rock have different physical properties and symmetries.

He is also endowed with a metamorphic face that at first appears skeletal but can communicate a spectrum of emotion with its bends and contortions.

Phlogopite occurs typically as a metamorphic product (e.g., in crystalline metamorphosed limestones) and also in ultramafic igneous rocks.

But there are others on whom this terrible pressure exerts a metamorphic power that turns some of their sadness into a compassion that is strong and diamond-brilliant.

In general, then, the chemical composition of a metamorphic rock will closely reflect the primary nature of the material that has been metamorphosed.

A pyroxene formed early in the cooling of an igneous melt or in a metamorphic fluid may later combine with water at a lower temperature to form amphibole.

As a result, placing a metamorphic rock within a particular facies indicates the broad pressure-temperature region in which the rock formed.

Migmatite, in geology, rock composed of a metamorphic (altered) host material that is streaked or veined with granite rock; the name means "mixed rock".