Ferrokentbrooksite

cyclosilicate

primary

Formula: Na15Ca6Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(F,Cl)2
Cyclosilicate (ring silicate)
Specific gravity: 3.06
Hardness: 5 to 6
Streak: White
Colour: Reddish brown, red
Environments:

Pegmatites

Ferrokentbrooksite is a rare zirconium-bearing cyclosilicate.

At the type locality, the Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada, ferrokentbrooksite is a primary late-stage phase in a small pegmatite dike in nepheline syenite (MinRec 35.4.348, Webmin). Associated minerals include serandite, rhodochrosite, nepheline, natrolite, microcline, gonnardite, fluorite, fluorapatite, catapleiite, calcite, ancylite-(Ce), albite and aegirine (Mindat, MinRec 35.4.348).

Common impurities: F,REE,K,Sr,Y,(Ti,Hf,Ta)

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