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Kentbrooksite Nepheline & Aegirine

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CSW201500

Kentbrooksite Nepheline & Aegirine

Rare mineral
Classic Locality

Description Tabs

Description
Locality: 
Alluaiv Mountains, Lovozero, Kola, Russian Federation
Size Range: 
Thumbnail (1-3cm)
Size: 
1.7 × 1.6 × 1.5 cm
Description

Nepheline matrix with areas of orange brown kentbrookite. There is also a nepheline crystal with 'starburst' inclusions of dark green aegirine crystals.

Mineral Data
What's on the rock

Kentbrooksite

Formula: 
(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2·2H2O
Strunz: 
9.CO.10
Crystal System: 
Trigonal
Hardness: 
5.0 - 6.0
Streak: 
White.
Type Locality: 
Kentbrooksite occurrence, Amdrup Firth, Kangerlussuaq Firth, Tunu Province (East Greenland), Greenland

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

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
Causeway Minerals

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Thank you for viewing my auctions. It goes without saying that maintaining high standards in both specimen quality and customer service are extremely important to me. If for any reason you are not happy with any aspect of your transaction then please let me know as soon as possible, ideally within 1 week of receiving your specimen. I will happily do all in my power to resolve the situation to your satisfaction. If your specimen is damaged upon delivery simply send me some photos to verify this and I'll provide you with a full refund minus postage. If you are simply unhappy with your specimen just email me within 1 week of receiving it. Return it to me and I will issue an immediate refund of the original transaction value including postage.

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