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Nepheline Var Elaeolite

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LGM734542

Nepheline Var Elaeolite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

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Description
Locality: 
Stavern, Larvik, Vestfold og Telemark, Norway
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.5 × 5.5 × 2.5 cm
Weight: 
53.00gr
Description

A blueish-grey, poorly developed nepheline var. elaeolite crystal with columnar shape, associated with grey feldspar and an unidentified black mineral (aegirine or ferro-edenite?). With typical greasy luster (Fatstone, Oilstone).

Name introduced by Karsten and Klaproth (1809) for a mineral from the the syenite-pegmatite-dykes at Friedrichswärn (= Stavern), Norway, which was later shown to be identical with nepheline. However, the name was used as a variety of nepheline during the 19th century (cit. mindat).

From old Dr. Krantz stock, comes with antique notice label.

Mineral Data
What's on the rock

Nepheline

Formula: 
(Na,K)AlSiO4
Strunz: 
9.FA.05
Hardness: 
5.5 - 6.0
Type Locality: 
Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy

Elaeolite

Variety Of: 

Nepheline

Formula: 
(Na,K)AlSiO4
Strunz: 
9.FA.05
Hardness: 
5.5 - 6.0
Hardness: 
0.0

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