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What elements/minerals are found in volcanic rock?

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What elements/minerals are found in volcanic rock?

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  1. I would like very much to know the answer to this. It could be easily found in any library, this is so much more fun and interesting.

    How about St. Helen In Washington, on U.S. soil?

    1984 or???

    Was it even Washington?


  2. ultra mafic= olivine periodote and periodotite

    mafic= augite and hornblende

    intermediate= feldspar (plagioclase, hornblende

    felsic= quartz feldspar (orthoclase)  biotite

  3. It varies...
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