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Grossular Var Caswellite With Willemite

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LGM1023309

Grossular Var Caswellite With Willemite

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
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
3 × 5.5 × 1.5 cm
Weight: 
27.40gr
Description

Caswellite is a variety of grossular garnet. It is derived from the hydrothermal alteration and replacement of hendricksite mica in the Franklin ore body, Franklin, New Jersey, USA. [cit. mindat]
Here is a sample containing a mass of caswellite with a flaky appearance. The color is beige. The caswellite itself show no UV fluorescence but the accompanying willemite fluoresces green.

Comes with nice old Dr. F. Krantz pen and ink label dated around or before 1902. Background: In June 1901, due to passing of some resolutions in the context of a reform of german orthography, the spelling of german "Contor" (branch office) was altered to "Kontor".

Mineral Data
What's on the rock

Grossular

Formula: 
Ca3Al2(SiO4)3
Strunz: 
9.AD.25
Hardness: 
6.5 - 7.0
Type Locality: 
Akhtaragda River mouth (Achtaragda River mouth), Vilyui River Basin (Vilui River Basin; Wilui River Basin), Sakha Republic (Saha Republic; Yakutia), Eastern-Siberian Region, Russia

Caswellite

Variety Of: 

Grossular

Formula: 
Ca3Al2(SiO4)3
Strunz: 
9.AD.25
Hardness: 
6.5 - 7.0
Hardness: 
2.5 - 3.0
Streak: 
White

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

Seller Information

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