metamorphic rock

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metamorphic rock

[¦med·ə¦mȯr·fik ′räk]
(petrology)
A rock formed from preexisting solid rocks by mineralogical, structural, and chemical changes, in response to extreme changes in temperature, pressure, and shearing stress.

metamorphic rock

Rock which has been altered in appearance, density, and crystalline structure (and in some cases mineral composition) by high temperature and/or high pressure; e.g., slate is a metamorphic rock derived from shale.
References in classic literature ?
She thought of the white freestone, the pillared portico, and the terrace full of flowers, Sir James smiling above them like a prince issuing from his enchantment in a rose-bush, with a handkerchief swiftly metamorphosed from the most delicately odorous petals--Sir James, who talked so agreeably, always about things which had common-sense in them, and not about learning
For the immaculate gentleman her cries had lured to what was to have been his death had been suddenly metamorphosed into a demon of revenge.
Mummy apples, which he had regarded as weeds, under her guidance appeared as appetizing breakfast fruit, and, at dinner, were metamorphosed into puddings that elicited his unqualified admiration.
From an Alaskan hero he was metamorphosed into an Alaskan bully, liar, desperado, and all around "bad Man.
And ten pounds, metamorphosed into quart bottles of beer, reared an immense and radiant vision, very like a brewery, inside his head.
Yet John Barleycorn metamorphosed him into a violent lunatic.
He wanted to be a poet, and he was one; he now wished to be a merry chirping bird: but when he was metamorphosed into one, the former peculiarities ceased immediately.
Ovid tells us of a flower into which Hyacinthus was metamorphosed, that bears letters on its leaves, which Virgil recommended as a miracle to the Royal Society of his day; but no age nor nation hath ever recorded a bird with a letter in its maw.
His eyes turned blood-shot, and he was metamorphosed into a raging fiend.
The boy metamorphosed into a savage on the instant.
I found the outer front courtyard, often mentioned here, metamorphosed into a butter shop; and I then almost gave up every brick of the jail for lost.
To save something toward the repayment of those creditors was the object toward which he was now bending all his thoughts and efforts; and under the influence of this all-compelling demand of his nature, the somewhat profuse man, who hated to be stinted or to stint any one else in his own house, was gradually metamorphosed into the keen-eyed grudger of morsels.