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Aegirine With Nepheline Var Elaeolite

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LGM820291

Aegirine With Nepheline Var Elaeolite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

Description Tabs

Description
Locality: 
Barkevik, Langesundsfjorden, Larvik, Vestfold og Telemark, Norway
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4 × 6.5 × 3 cm
Weight: 
107.00gr
Description

Massive, blueish-grey nepheline var "elaeolite" (Fatstone, Oilstone) with oily or greasy luster in-grown in pegmatitic matrix (pic 3), associated with a crystal of dark green aegirine (pic 1). Minor black mica is also present.

Comes with nice old pen and ink label. As early as 1872 Bernard Stürtz (1845-1928) had established himself as a mineral dealer in Bonn am Rhein, in a dealership that had been founded by his wife in 1866.
Stürtz was proprietor of what he called his Mineralogisches und palaeontologisches Comptoir ("Mineralogical and paleontological office"), dealing in "minerals, meteorites, rocks, ores, fossils, models, scientific instruments and preparations". His stock was bought out by Dr. A. Krantz very likely in the 1920's.

 

Mineral Data
What's on the rock

Aegirine

Formula: 
NaFe3+Si2O6
Group Parent: 
Clinopyroxene Subgroup
Strunz: 
9.DA.25
Crystal System: 
Monoclinic
Hardness: 
6.0
Type Locality: 
Rundemyr, Øvre Eiker, Buskerud, Norway

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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