jī xuè shí
bloodstone
red-fleck chalcedony
heliotrope (mineralogy)
Táng chū Sì Dà jiā
Four Great Poets of early Tang
refers to Yu Shi'nan 虞世南[Yu2 Shi4 nan2], Ouyang Xun 陽歐詢|欧阳询[Ou1 yang2 Xun2], Chu Suiliang 楮遂良[Chu3 Sui4 liang2] and Xue Ji 薛稷[Xue1 Ji4]