A coarse-grained porphyritic granite from the Llano Uplift of Central Texas. A wild rapakivi/anti-rapakivi feldspar. Core of K-spar shows plagioclase overgrowth (rapakivi) followed by partial K-spar overgrowth (anti-rapakivi). Polished sample from the Granite Mountain Batholith near Marble Falls. Image is a close up of this image.