Quite a large, well formed Japan-law twin of quartz crystals from one of the most prolific generators of such twins. This particular one is very flattened and shows two twin members, 9.8 cm, tip to tip at the Japan-law axial angle of 84 degrees, 33 minutes. This is pretty large for Washington Camp. The largest twin member has a sceptre-like quartz overgrowth near its tip. An excellent example!