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Eudialyte Aegirine Nepheline & Feldspar

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MNT205235

Eudialyte Aegirine Nepheline & Feldspar

ex Dr. H.J. Wilke (GER)
Classic Locality

Description Tabs

Description
Locality: 
Khibiny Massif, Kola, Russian Federation
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.6 × 7.6 × 4 cm
Description

Very interesting and representative example of this complex paragenesis out of pegmatitic areas in nepheline-syenitic rocks of the Khibiny complex: cherry red eudialyte is intergrown with dark aegirine, greenish-greyish feldspar and some tan-whiteish nepheline (which is known from there to give a nice LW-UV fluorescence, orange). Rare and quite attractive stuff!

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

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

Feldspar

Group Parent: 
Feldspar Group

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Best regards Roger

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