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Formula: Na15Ca6Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(F,Cl)2
Cyclosilicate (ring silicate), eudialyte group,
zirconium-bearing mineral
Crystal System: Trigonal
Specific gravity: 3.06 measured, 3.06 calculated
Hardness: 5 to 6
Streak: White
Colour: Reddish brown, red
Common impurities: F,REE,K,Sr,Y,(Ti,Hf,Ta)
Environments:
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).
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