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A fine-grained rock has the following mineral composition;50 percent potassium feldpar (ortho-clase),?

26 percent quartz,13 percent plagioclase feldspar,8 percent biotite mica,and 3 percent of the amphiobole hornblende. The rock would most likely be

1.- granite

2.- rhyolite

3.- gabbro

4.- basalt

2 Answers

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  • 1 decade ago
    Favorite Answer

    2 - rhyolite

    The other answerer is incorrect since you state that it is a FINE grained rock & not a COARSE grained rock of the same composition.

  • Anonymous
    1 decade ago

    1 - granite

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