Well, granite is a typical rock that   is granular and phaneritic in texture. so it may be called a compound. It's formed from the molten magma, so according to me, it's a compound.
hope it helped. ^_^

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well, it's better to follow your book, because the information I gave has a universal source. It's always better to follow the book though.
Wait a minute....
Are you talking about Granite or Grenite?
because Grenite is made with up to 85% recycled, post-consumer materials
and the "Granite" you've wrote is different
Granite is the best-known igneous rock. Many people recognize granite because it is the most common igneous rock found at Earth's surface and because granite is used to make many objects that we encounter in daily life. so,it is a heterogeneous mixture. 
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