A Geoscience Digital Image Library

TitleFranklinite in calcite, from Franklin, New Jersey, USA
DescriptionFranklinite is a member of the spinel group and has formula ZnFe2O4. It is an important ore mineral of zinc and iron. Specimens from Franklin, New Jersey, often contain rounded black grains of franklinite surrounded by white calcite – as in this photo. Franklinite is also sometimes associated with greenish willemite and red zincite. In this photo, the largest franklinite crystal has an octahedral shape (although the edges of the crystal are rounded).
LocationUSA ▹ New Jersey ▹ Sussex. Near Franklin.
PhotographerNessa Eull. 2001-04-19.
CollectionUniversity of North Dakota Mineralogy Collection #355.
Key wordsFranklinite, calcite, New Jersey
Tech details423 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number353