Xu Collection, Upper Volume Radical: Metal (jīn) 鋁 Kangxi stroke count: 15 Page 1306, Entry 08 Jade Chapters (Yupian): The same as the term for grinding. Broad Elegance (Boya): Aluminum is called a whetstone. Master Yang's Regional Dialects (Fangyan): In the Yan and Qi regions, rubbing something with aluminum is called xi. Commentary: Aluminum, pronounced lu (falling-rising tone).