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Zincite With Willemite & Franklinite

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QRI671846

Zincite With Willemite & Franklinite

Rare Mineral

Description Tabs

Description
Locality: 
Sterling Hill, Ogdensburg, Sussex County, New Jersey, United States of America
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
9.3 × 4.7 × 4 cm
Description

Rich specimen displaying zincite, willemite and franklinite. Zincite makes the classic red spots and it is associated to franklinite, which makes the jet black ones. The highlight of the specimen is rather willemite, which appears as a thick green vein across the rock and dramatically increases the color contrast. Possibly also some calcite in between, although I did not check the fluorescence.
Very rich and colorful, quite representative for the three species. The pasted label (in German) testifies that this is a rather old specimen, possibly dated back to the 60s, when it was acquired by a Swiss collector I have recently purchased it from.

Pasted Label
Mineral Data
What's on the rock

Zincite

Formula: 
(Zn,Mn2+,Fe2+)O
Strunz: 
4.AB.20
Crystal System: 
Hexagonal
Hardness: 
4.0
Type Locality: 
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Willemite

Formula: 
Zn2SiO4
Strunz: 
9.AA.05
Hardness: 
5.5
Streak: 
White
Type Locality: 
Vieille Montagne (Altenberg; Kelmisberg), Moresnet, Kelmis, Plombières-Vieille Montagne District (Plombières-Altenberg), Verviers, Liège Province, Belgium

Franklinite

Formula: 
Zn2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.0
Colour: 
Black
Type Locality: 
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

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