object
Stibium
Stibium is an antimony sulphide ore compounded for eye salves and plasters; Roman writers keep it distinct from lead compounds and from generic soot.
Admitted autonomously from source pliny-nh (NH 33 (fixture paraphrase of antimony ore)).
Discovery method: OPEN_WORLD_SOURCE_EXTRACTION.
Extraction reason: Identity clause (“X is a/an …”) in source passage.
Identifying passage: Stibium is an antimony sulphide ore compounded for eye salves and plasters; Roman writers keep it distinct from lead compounds and from generic soot.