Wu Collection, Lower Volume Radical: Stone (shí) 硝 Kangxi strokes: 12 Page 830, Entry 15 According to Expanded Rhymes (Guangyun), it is pronounced xiao. According to Collected Rhymes (Jiyun) and Rhyme Collection (Yunhui), it is pronounced xiao. According to Correct Rhymes (Zhengyun), it is pronounced xiao. Mangxiao, a name for a medicinal substance. According to Correct Character Mastery (Zhengzitong), in medical treatises, there are seven types of xiao: poxiao, mangxiao, yingxiao, mayaxiao, xiaoshi, fenghuaxiao, and mingfen. It was originally written as xiao, but the common practice corrupted it into xiao. Also, according to Collected Rhymes (Jiyun), it is pronounced qiao. It describes the appearance of a stone being hard.