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Willemite Var Troostite With Franklinite In Calcite

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PDM922892

Willemite Var Troostite With Franklinite In Calcite

Fluorescent

Description Tabs

Description
Locality: 
Franklin, Sussex County, New Jersey, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.5 × 4.2 × 2.6 cm
Weight: 
78.00gr
Description

Euhedral reddish-brown troostite crystals (a variety of willemite) with black franklinite crystals in a matrix of white calcite, a classic combination from Franklin. Under short ultraviolet light the colours are very intense: troostite displays green fluorescence, while calcite is deep orange-red. Under long waves the troostite is green and calcite is not fluorescent.

Obtained from Gilbert Gauthier (gauthierite) in 1990. Ex. PhD Geologist Bob Janssens, #1707.

Combine specimens to reduce shipping costs!.

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: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

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