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Willemite Var Troostite With Franklinite & Calcite

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LGM114689

Willemite Var Troostite With Franklinite & Calcite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

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Description Tabs

Description
Locality: 
Franklin, Sussex County, New Jersey, United States of America
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 8 × 5.5 cm
Largest Crystal: 
1.50cm
Description

Well-formed brown troostite crystal together with black franklinite in non-fluorescent white calcite.
The specimen shows intensive green and blue fluorescence in SW UV.
Comes with nice old Krantz label.
Weight: 390 grams

Mineral Data
What's on the rock

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

Troostite

Variety Of: 

Willemite

Formula: 
Zn2SiO4
Strunz: 
9.AA.05
Hardness: 
5.5
Formula: 
(Zn,Mn)2SiO4
Hardness: 
0.0

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

Calcite

Polymorph of: 
Aragonite and Vaterite
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Seller Information

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