beacon_rock_basalt_2004.jpg

BASALT-

-extrusive

GRAIN SIZE: 2MM.

COLOR: usually dark colored common colors are dark grey, dark green, black, and a brownish.

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FORMATION: the outpouring of magma, the magma cools quickly forming only small crystals

WHATS FOUND IN IT: minerals from the silicate group, and large amounts of silicon and oxygen

WHERE IT FORMS: at the top of a valcano at the surphace

USES: it makes up most of the world

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http://wiki.answers.com/Q/What_colors_are_basalt_rocks_come_in
http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0015220.html
http://jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry27.html