METAMORPHIC ROCK IDENTIFICATION QUESTIONS AND ANSWERS

TEST BANK FOR PHARMACOLOGY 10TH EDITION BY MCCUISTION
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METAMORPHIC ROCK IDENTIFICATION
QUESTIONS AND ANSWERS

Slate - ans-Parent Rock: Shale or Mudstone
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Texture: Foliated; Very fine-grained ws ws ws




Type of metamorphism: Regional
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Colors: gray in color and range in a continuum of shades from light to dark gray. Occurs in shades of
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green, red, black, purple, and brown.
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Description: created by the alteration of shale or mudstone by low-grade regional metamorphism.
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Greenstone - ans-Parent Rock: Basalt; Mafic igneous rocks ws wsws ws ws ws ws ws




Texture: Non-foliated to weakly-foliated; Fine-grained
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Type of metamorphism: Regional
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Color: Green ws




Description: a tough, dark altered basaltic rock that once was solid deep-
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sea lava. It belongs to the greenschist regional metamorphic facies.
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Marble - ans-Parent Rock: Limestone or Dolostone
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Texture: Non-foliated; Medium- to coarse-grained
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Type of metamorphism: Contact
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Colors: Marble is usually a light-ws ws ws ws ws




colored rock. When it is formed from a limestone with very few impurities, it will be white in color. Mar
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ble that contains impurities such as clay minerals, iron oxides, or bituminous material can be bluish,
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gray, pink, yellow, or black in color.
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Description: reacts to HCl. Forms when limestone is subjected to the heat and pressure of metamorp
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hism. It is composed primarily of the mineral calcite (CaCO3) and usually contains other minerals, su
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ch as clay minerals, micas, quartz, pyrite, iron oxides, and graphite. Under the conditions of metamor
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phism, the calcite in the limestone recrystallizes to form a rock that is a mass of interlocking calcite cr
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ystals. A related rock, dolomitic marble, is produced when dolostone is subjected to heat and pressur
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e.

Tektite - ans-Parent Rock: Any
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Texture: ws




Type of metamorphism: Impact
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Description: gravel- ws




size bodies composed of black, green, brown or gray natural glass formed from terrestrial debris ejec
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ted during meteorite impacts.
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Phyllite - ans-Parent Rock: Shale or Mudstone
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Texture: Foliated; Fine-grained ws ws




Type of metamorphism: Regional
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Description: made up mainly of very fine- ws ws ws ws ws ws




grained mica. The surface is typically lustrous and sometimes wrinkled. It is intermediate in grade be
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tween slate and schist. ws ws ws




Amphibolite - ans-Parent Rock: Basalt; Mafic igneous rocks ws wsws ws ws ws ws ws




Texture: Non-foliated to weakly-foliated; Medium-grained
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Type of metamorphism: Regional
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