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Franklinite Willemite

#PD30626
SOLD
Franklinite from Franklin, Sussex Co., New Jersey, United States - PD30626
Franklinite from Franklin, Sussex Co., New Jersey, United States - PD30626

Franklinite Willemite

#PD30626
Availability
Sold
Size
11 x 5 x 6.5 cm - Cabinet 
Formula
ZnFe3+2O4 (RRUFF)
Locality
Franklin, Sussex Co., New Jersey, United States
Tagged
Ore Minerals

This is a really fine big Franklin Ore specimen with huge black octahedral Franklinite crystals to 3cm on course crystalline Franklinite and Willemite matrix. Of course all the Willemite fluoresces bright green under UV light, see pop-up photo. Also, a label from the University of Chicago - Dept of Geological Sciences accompanies this specimen with the number 1093 that corresponds to a number on the side of the specimen. The specimen most likely originated from Paul Moore.
According to the Bateman's classic work "Economic Mineral Deposits" - Second Edition (1950), which although it is over 60 years old still has great relevant information on deposits, the Franklin-Sterling Hill Zinc District has been mined since 1840 and is unique with no known counterpart in the world.

Franklinite

Formula
ZnFe3+2O4 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive, Crystalline - Fine 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
black, brownish black 
Streak
reddish brown 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
5.5-6 

Data courtesy of Webmineral.

Collection
Phillips Collection
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