1. Penninite: While this green, layered mineral is found elsewhere, it was first discovered and named in Pennsylvania in the 1800s, specifically in the Chester County area.
2. Chabazite: This zeolite mineral is also found globally but was first identified in Pennsylvania, in the Lehigh Valley region, during the 19th century.
3. Franklinite: This iron-zinc-manganese oxide mineral is named after Franklin, New Jersey, where it was first discovered. However, it was later found in significant quantities in the Franklin-Ogdensburg Mining District, which spans the border between Pennsylvania and New Jersey. This discovery further solidified the significance of this mineral in the region.
While these minerals were not found in Pennsylvania before anywhere else in the world, their discovery in Pennsylvania played a significant role in their identification and recognition in the scientific community.