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Narsarsukite Fergusonite & Ferrokentbrooksite

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SER916110

Narsarsukite Fergusonite & Ferrokentbrooksite

Description Tabs

Description
Locality: 
Água de Pau Volcano, São Miguel Island, Azores District, Portugal
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.6 × 1.1 cm
Description

a pink lustrous narsarsukite crystal with yellow titanite ; in another vug, a cluster of ferrokentbrooksite with an orange ball of fergusonite ; self collected on 2013

Mineral Data
What's on the rock

Narsarsukite

Formula: 
Na4(Ti,Fe)2[Si8O20](O,OH,F)2
Strunz: 
9.DJ.05
Hardness: 
7.0
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), Narsaq, Kujalleq, Greenland

Fergusonite

Synonym Of: 

Fergusonite-(Ce)

Formula: 
(Ce,La,Nd)NbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5

Fergusonite-(Y)

Formula: 
YNbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5

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