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Nepheline & Albite

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MCH624252

Nepheline & Albite

Description Tabs

Description
Locality: 
Saga #1 Quarry, Sagåsen, Mørje, Porsgrunn, Vestfold og Telemark, Norway
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
14.5 × 10.9 × 3.8 cm
Weight: 
683.00gr
Description

Large, grey coloured crystals of nepheline are embedded in white albite. At the contact to the albite the nepheline crystals show a narrow, pinkish reaction rim of unknown composition.

An impressive but not untypical specimen from the Langesundsfjord/Larvikite region in Southern Norway. Collected in 1992.

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

Albite

Formula: 
NaAlSi3O8
Strunz: 
9.FA.35
Crystal System: 
Triclinic
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Finnbo (Finbo), Falun, Dalarna, Sweden

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