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WANTED. http://www.rocksandminerals4u.com/example_of_igneous_rocks.html. Rhyolite (Igneous Rock)- It is light in color and is a volcanic rock. It is very Viscous because it has a high silica content. This causes gases to be trapped which makes rhyolite rocks to me explosive.

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http://www.rocksandminerals4u.com/example_of_igneous_rocks.html

Rhyolite (Igneous Rock)-

It is light in color and is a volcanic

rock.

It is very Viscous because it has a high silica content.

This causes gases to be trapped which makes rhyolite rocks to me explosive.

Some mineral types include quartz, feldspar and biotite

Rhyolite is erupted at temperatures of

700 to 850° C.

Rhyolite eruptions often produce pumice or obsidian


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Conglomerate (Sedimentary Rock)-

  • There are three min groups that

    sedimentary rocks are classified into

    (clastic, Chemical and organic) this rock is clastic.

  • Has large rounded particles (the particles get rounded by a source of moving water)

  • The space between the large particles is generally filled with smaller particles and/or a chemical cement that binds the rock together.

  • The color, hardness and other characteristics of the rock varies in a rather large range

http://library.thinkquest.org/J002289/images/conglomerate.jpg


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Gneiss (Metamorphic Rock)-

  • It is medium to course grained rock

  • The rock is normally grey or pink but then it has dark streaks and layers

  • Feldspar is an abundant mineral and, together with quartz, forms the granular, lighter colored layers. Muscovite, biotite and hornblende are commonly present, while any of the minerals characteristic of higher grades of regional metamorphism may occur.


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