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Franconite crystals - click for larger pic
Franconite aggregates
L. Horváth sp.
Photo by Violet Anderson
© Royal Ontario Museum

Franconite crystals - click for larger pic
Franconite crystals
© Doug Merson

Franconite crystals - click for larger pic
Franconite crystals
© Modris Baum

Franconite crystals - click for larger pic
Franconite crystals
© Stephan Wolfsried

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Home > Mineral Descriptions > Franconite - (7 Photos)



Franconite
Na2Nb4O11 · 9H2O

     At MSH, the second known locality for this mineral, it had been recognized as a new species and designated for a number of years as UK #43.

     It bears very close ressemblance to hochelagaite, its Ca-analog and a few other minerals. In the paragenetic sequence in all modes of occurrence, franconite appears to be one of the latest minerals formed.

PHYSICAL CHARACTERISTICS:

Color is white to colorless.
Luster is vitreous to silky.
Diaphaneity: the crystals are transparent to translucent.
Crystal System is monoclinic; (??).
Crystal Habits normally as radiating short white capillary crystals
   from a solid core to 1-2mm.
Cleavage none.
Fracture is (??).
Hardness is (??).
Specific Gravity is approximately 2.7 g/cm3
Streak is white.
Associated Minerals include aegirine, albite, analcime, calcite,
   catapleiite, dawsonite, gaidonnayite, microcline, natrolite, pyrite,
   siderite and sodalite.
Distinguishing Features include its fluorescence, which helps
   in distinguishing it from hochelagaite.
Origin: Named in 1984 for its discovery locality in the Francon quarry,
   St-Michel, Québec, Canada.

CLASSIFICATION:

Dana System
# 8.6.1.1

Strunz Classification
# IV/D.06-40

REFERENCES:
CanMin 22:239-243 (1984), MinRec 21:310 (1990), Dana 8:367 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
¤¤

MC
¤¤

HF
¤¤

BR
--

SX
--

FR
--

Legend

Franconite crystals - click for larger pic
Franconite crystals
© Elmar Lackner

Franconite crystals - click for larger pic
Franconite crystals
© Elmar Lackner

Franconite crystals - click for larger pic
Franconite crystals
© Steven Stuart