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Feklichevite & Ferrokentbrooksite

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SHS141288

Feklichevite & Ferrokentbrooksite

Description Tabs

Description
Locality: 
Langesundsfjorden, Porsgrunn, Vestfold og Telemark, Norway
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 1.9 × 0.7 cm
Description

Feklichevite and ferrokentbrooksite in matrix

Mineral Data
What's on the rock

Feklichevite

Formula: 
Na11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5
Strunz: 
9.CO.10
Hardness: 
0.0
Streak: 
Brownish
Type Locality: 
Kovdor Phlogopite mine (Mica Mine; Slyuda Mine; Kovdorslyuda Shaft), Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia...

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