Mount Du (Chinese: 独山; pinyin: Dú Shān), which means Lonely Hill in Chinese, is a small mountain near Nanyang City, Henan province, China.

The hill is rich in a jade substitute or simulant stone, saussurite.

It is not the true jade found in Xinjiang, China: nephrite, a CaMg silicate (Si), nor the true jade found in Burma: jadeite, a NaAl silicate (Si).

It is a fine grained mixture of feldspar and epidote.

On the third day of the third month of the Chinese calendar, people climb the mountain.