Fig. 53.-Comparison of distribution of perthitic albite lamellae in K-feldspar (A) with acicular apatite inclusions in albite (B)

Both thin sections perpendicularly cut the b axis of the Manebach twin. The orientation of the acicular apatite is parallel to the projection Nm single prime of Nm on the (010) plane. Plane polarized light. Shanbei leucogranite, Taishan County, Guangdong Province.