Crystals Minerals Mineralogy c.1800 W. Kneass lot x 5 fine engraved printsCrystallography. (science crystals diamonds stone cutting facets). Issued c. 1800, Philadelphia. Engraved by W. Kneass. Unique and interesting lot of early American engravings by one of the earliest Chief Engravers at the U. S. Mint. Of note for this reason as well as the connection to minerals and diamonds. Total of five antique copper engraved prints, each signed in the plate by Kneass. All display light signs of time, some gentle age, scattered