“Onycha” is one of the most mysterious substances mentioned in the Bible. It occurs as an ingredient in the recipe for sacred incense given in Exodus 30 v.34:
"And the Lord said unto Moses, Take unto thee sweet spices, stacte, and onycha and galbanum, these sweet spices together with pure frankincense of each shall there be a like weight."
Unfortunately, this reference does not give any clear indication as to what "Onycha" actually is! However, a starting point is the fact that the name is the ancient Greek word for "Finger Nail".