Here is a link to a great virtual rock kit: http://www.earthscienceeducation.com/virtual_rock_kit/index.htm
Here is a list of all unique rock types as recognized by petrologists:
1. Igneous
2. Metamorphic
3. Sedimentary
Source: http://en.wikipedia.org/wiki/List_of_rock_types
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In geology, rock or stone is a naturally occurring solid aggregate of minerals and/or mineraloids.
The Earth's outer solid layer, the lithosphere, is made of rock. In general rocks are of three types, namely, igneous, sedimentary, and metamorphic. The scientific study of rocks is called petrology, and petrology is an essential component of geology.
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Also looking at:
Volcanic / Magma
Plutonic
Basalt
Gneiss
Quartzite
Granite
Schist
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Link: On the origin of early Archaean gneisses by A. Y. Glikson - http://www.springerlink.com/content/r459kx50j0764622/
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