George Leo Haydock, on Exod 30:34

“And the Lord said to Moses: Take unto thee spices, stacte, and onycha, galbanum of sweet savour, and the clearest frankincense, all shall be of equal weight.”

“Onycha. An aromatic root, shining like “the nail,” or perhaps the bdellium of Arabia, which is clearer than that of the Indies. (Dioscor.; Galen Medic.) It distills from a tree. Others affirm, that it is the shell of a fish which feeds on spikenard (spica nardi) in the watery places of India. — Galbanum, an unctuous gum, of a strong but not very agreeable smell when alone. — Frankincense, is a juice proceeding by incision from the trees of Saba. — Weight. The Rabbins say 70 or 74 pounds of each.”

Imported from an open dataset — not yet checked against the printed edition.