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Formula: Na (Nb2O5) (OH) · 3H2O. Colour: White, colorless, grayish blue. Lustre: Adamantine, Vitreous, Silky. Hardness: 4. Specific Gravity: 2.72.
Comments: Irregular to ball-shaped aggregates of silky white franconite on white albite. Location: Mont St. Hilaire, Quebec, Canada. Scale: Specimen Size 2.5 x 4 cm.
Franconite (on the right) spans ~ 2⅓ mm. Found Oct 1994. MOB coll. Decent enough "tight packed" franconite, but the real point of the photo is to show the aegirine. Not only is the dark green stuff aegirine, but so is the nearly colorless fibrous stuff (which actually grows out of the darker stuff).
Franconite Na2Nb4O11 •9H2O. c 2001-2005 Mineral Data Publishing, version 1. Crystal Data: Monoclinic. Point Group: n.d. In bladed to highly elongated crystals with curved faces; in globules composed of radiating crystals, to 2 mm; aggregated in groups. Physical Properties: Cleavage: Basal, parting.
Jul 5, 2018 · The crystal structure of franconite, NaNb 2 O 5 (OH)·3H 2 O, has been characterized by single-crystal X-ray diffraction using material from Mont Saint-Hilaire, Québec, Canada.
Abstract. The new mineral species franconite occurs as white 150-mu m globules on crystals of weloganite, calcite and quartz in vugs in a
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May 1, 1984 · The crystal structure of franconite, NaNb2O5(OH)·3H2O, has been characterized by single-crystal X-ray diffraction using material from Mont Saint-Hilaire, Québec, Canada.