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Yes, granite can become a breccia. A breccia is just a sedimentary rock in which the angular fragments are cemented together. It is like a conglomerate but instead of rounded particles as in the conglomerate, the particles are angular.

One way in which a granite can turn into a breccia is along the base of a granite mountain or cliff. The granite mountain breaks down into smaller pieces and forms a talus slope at the base of the mountain. Then the angular fragments are cemented together to produce the breccia.

Another way would be along a fault zone in granite. The movement of the fault breaks the granite into angular pieces. These angular pieces could be cemented together to create the breccia.

Granite = igneous rock, breccia = sedimentary rock.

Most likely granite would turn into breccia along a fault zone. Shearing along the fault will fragment the granite as well as compressing the fragments. They can be "cemented" together with a matrix formed from precipitates of liquid flowing along the fault (e.g. rainwater). Breccia can be composed of just about anything. You are correct that granite is mainly composed of quartz, feldspars, and micas.

no longer quickly. whilst the obsidan is broken down into kaolanite (volcanic clay) extra minerals are produced. consequently extra minerals are produced. If this accretion is then buried to a intensity the place partial melting occurs then the minerals might desire to in theroy be re-presented into the mantle soften. this could then be forced up into the magma chamber and cooled forming a granite. yet another posibility is that a volcano might desire to push up by using a mattress of kaolanite inflicting xenoliths (rock fragments) of the clay to be mixed into the magma.