Biotite granite found in China, a coarse grained, felsic intrusive rock belonging to the granite family. The minerals which make up a granite are typically quartz, feldspars and micas. In the case of biotite granite, the constituent minerals are milky (white) quartz, plagioclase feldspar and biotite mica crystals. The biotite appears as small black 'flecks' on the surface of the specimens with the quartz and feldspar making up the majority of the rock. The pieces are supplied in a white card tray with a information label. .