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Ferrokentbrooksite

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GFM738601

Ferrokentbrooksite

Description Tabs

Description
Locality: 
Barkevikskjær, Barkevik, Langesundsfjorden, Larvik, Vestfold og Telemark, Norway
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.3 × 2.9 × 1.3 cm
Description

orange brownish glassy crystal aggregates of 2 cm in Nepheline-Feldspar matrix. Old specimens collect all round 1960

Mineral Data
What's on the rock

Ferrokentbrooksite

Formula: 
Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2
Strunz: 
9.CO.10
Crystal System: 
Trigonal
Hardness: 
5.0 - 6.0
Streak: 
white
Type Locality: 
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada