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Eudialyte Wöhlerite Zircon & Thorite

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MCH185781

Eudialyte Wöhlerite Zircon & Thorite

Description Tabs

Description
Locality: 
Saga #1 Quarry, Sagåsen, Mørje, Porsgrunn, Vestfold og Telemark, Norway
Size Range: 
Cabinet (10-18 cm)
Size: 
11 × 8 × 2.8 cm
Description

A specimen very well suited for a petrographic rock collection: a coarse grained nepheline-syenitic pegmatite specimen from the famous Langesundsfjord area in Norway. It is full of crystals of partly unusual minerals that are characteristic for this geological environment as redbrown eudialyte, yellow wöhlerite, microcline, dark grey nepheline, white zeolithe, dark ferro-edenite, black biotite, brown zirkon, orange thorite as well as silver sparkling molybdenite. The specimen is very slighly radioactive due to thorite and possibly finely disseminated pyrochlore.

Mineral Data
What's on the rock

Eudialyte

Formula: 
Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Strunz: 
9.CO.10
Hardness: 
5.0 - 6.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

Wöhlerite

Formula: 
NaCa2(Zr,Nb)(Si2O7)(O,OH,F)2
Strunz: 
9.BE.17
Hardness: 
5.5 - 6.0
Type Locality: 
Løvøya (Løvø; Lövö; Lövöe), Langesundsfjorden, Porsgrunn, Telemark, Norway

Zircon

Formula: 
ZrSiO4
Strunz: 
9.AD.30
Crystal System: 
Tetragonal
Hardness: 
7.5
Streak: 
White

Thorite

Formula: 
(Th,U)SiO4
Strunz: 
9.AD.30
Crystal System: 
Tetragonal
Hardness: 
4.5
Type Locality: 
The Thorite Hole, Løvøya (Løvø; Lövö; Lövöe), Langesundsfjorden, Porsgrunn, Telemark, Norway

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