红玄武土颗粒：微小的松软土，尤指用作颜料的一种红棕色粘土。

Any of various soft, fine clays, especially a reddish-brown variety used as a pigment.

youdao

红玄武土颗粒：微小的松软土，尤指用作颜料的一种红棕色粘土。

Any of various soft, fine clays, especially a reddish-brown variety used as a pigment.

youdao