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Ferrokentbrooksite crystals
© Douglas Merson
Ferrokentbrooksite crystals
© Modris Baum
Ferrokentbrooksite crystals
© Jason B. Smith
Ferrokentbrooksite crystals
© Stephan Wolfsried
Na15Ca(Fe,Mn)ZrNbSi2573(O,OH,HO)(Cl,F,OH)
Ferrokentbrooksite, is a new member of the eudialyte group from Mont Saint-Hilaire, Quebec; it is the ferrous-iron-dominant analogue of kentbrooksite. It cannot be distinguished visually from other eudialyte group minerals present at MSH.
PHYSICAL CHARACTERISTICS:
Color is reddish-brown to red.
Luster is vitreous.
Diaphaneity is transparent.
Crystal System is trigonal,
Crystal Habits include pseudo-octahedral crystals to 1 cm in diameter
Cleavage none, no parting.
Fracture is uneven to conchoidal.
Hardness is ~ 5 – 6.
Specific Gravity is > 3.06 g/cm
Streak is white.
Associated Minerals include aegirine, albite, ancylite-(Ce), calcite,
catapleiite, fluorite, fluorapatite, gonnardite, microcline, nepheline
(partially altered to natrolite), natrolite, rhodochrosite and sérandite.
Distinguishing Features: Requires analysis for confirmation. Brittle.
Origin: Named in 2003 to reflect its composition; the ferrous-iron
dominant analogue of kentbrooksite.
CLASSIFICATION:
Dana System
# 64.1.1.7
Strunz Classification
# VIII/E.25-60
REFERENCES:
CanMin 41:55-60 (2003)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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