- Augite (Var: Jeffersonite)
- Franklin Mining District, Sussex Co., New Jersey, USA
- Miniature, 3.7 x 3.2 x 2.1 cm
Jeffersonite is the very rare zincian manganoan variety of augite, a clinopyroxene and was originally described from Franklin. This aesthetic cluster of lightweight, brownish crystals is dominated by the large, sharply terminated crystal, which is, in fact, doubly terminated. Old-time, classic and seldom-seen material. Comes with an expertly handwritten, faded label from an older collection. The collection this came out of was a museum stash dating to prior to World War I.