are crystals a metamorphic rocks

Variation of the Length/Thickness Ratio of Biotite Crystals of ...
of the length/thickness ratio of biotite crystals of metamorphic rocks: Jour. Geology, v. 80, p. 112-. 120. VARIATION OF THE LENGTH/THICKNESS. RATIO OF .
http://www.jstor.org/stable/30061151

Rock Key
It shows nearly flat, shiny faces in almost rectangular or long thin needle like crystals in rock. Hornblende is usually found in dark colored metamorphic rocks; .
http://www.rockhounds.com/rockshop/rockkey/index.html

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How to Identify Igneous Rocks - wikiHow
Jun 19, 2011 . Most igneous rocks have interlocking crystals. In some igneous rocks these crystals are large enough to see without a lens. Other igneous .
http://www.wikihow.com/Identify-Igneous-Rocks

Lab 4: Rock-cycle and Igneous Rocks Earth 202: Earth's Interior
Cooling Rate and Crystal Size: Before we learn how to identify igneous rocks, we will first demonstrate how the rate of cooling affects the size of mineral crystals.
http://www.earth.northwestern.edu/people/seth/202/Labs/rocklab.08.pdf

Igneous and Metamorphic Rocks
Porphyroblasts are larger crystals in a finer-grained matrix. The metamorphic rock will bear the name of the dominant porphyroblasts, e.g. garnite schist.
http://topex.ucsd.edu/es10/lectures/lecture16/lecture16.html

Are crystals, like amethyst, an example of igneous rock or ...
Mar 6, 2012 . Amethyst is actually classified as a mineral. Most rocks are made of minerals. Minerals have a specific chemical composition with atoms .
http://www.enotes.com/science/q-and-a/crystals-like-amethyst-an-example-igneous-rock-320973

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Rock Cycle - Geography - About.com
Slowly cooling igneous rock will usually contain larger mineral crystals than igneous rock that cools more quickly. The magma that forms igneous rock beneath .
http://geography.about.com/cs/physicalgeography1/a/rockcycle.htm

Crystal - Wikipedia, the free encyclopedia
Some crystals have formed by magmatic and metamorphic processes, giving origin to large masses of crystalline rock. The vast majority of igneous rocks are .
http://en.wikipedia.org/wiki/Crystal

Metamorphic Rocks
Degree of Metamorphism. Texture. Mineralogy. As metamorphism proceeds there is growth of new crystals, therefore many metamorphic rocks have .
http://geo1.tcu.edu/busbey/geo10113/metamorphicrocks.pdf

Lecture 6 METAMORPHIC ROCKS CHAPTER 8
CONDITIONS CAUSING METAMORPHISM. TEMPERATURE. Increasing temperature has several effects on rocks: 1) crystals tend to grow larger by joining .
http://www.efn.org/~agrush/introgeo/Lecture6.pdf