date: sunday march 14th 2010
author: no author
http://geology.com/rocks/igneous-rocks.shtml
this website has a bunch of pictures of the rocks and information about them.
Granite: This igneous rock is felsic, intrusice and it used to make counter tops and is a building stone
Basalt: Basalt is extrusice and crushed basalt is used for railroad ballast.
Gypsum: Processed gypsum is used in industrial or building plaster, prefabricated wallboard, cement manufacture, and for agriculture.
Graphite: Graphite is the crystal form of carbon. It is used as a dry lubricant and steel hardener and for brake linings and is used as lead in pencils.
Copper: Copper is used in electric cables and wires, switches, plumbing, heating, electrical, and roofing materials; coins; electronic components; jewelry ;industrial machinery and equipment; and transportation
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