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Silicate

Gjerdingenite-Fe

K₂Fe(Nb,Ti)₄(Si₄O₁₂)₂(O,OH)₄·6H₂O
Hardness5
Crystal systemMonoclinic
ClassSilicate
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Gjerdingenite-Fe specimen

Gjerdingenite-Fe Locality: Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway Yellowish crystals of Gjerdingenite-Fe (analysed) Field of view 3 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0

Gjerdingenite-Fe

Gjerdingenite-Fe is an IMA-recognized mineral species in the silicate class, with the chemical formula K₂Fe(Nb,Ti)₄(Si₄O₁₂)₂(O,OH)₄·6H₂O.

It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Labuntsovite structural group.

Key properties: Mohs hardness 5; specific gravity 2.82; White to faint yellow streak; Vitreous to waxy luster; optically biaxial.

IMA symbol Gje-Fe, IMA status: approved, named in 2001.

Found in miarolitic cavities in a sodic granite.

It is found associated with Quartz, orthoclase, albite, aegirine, kupletskite, elpidite, lorenzenite, pyrochlore, monazite-(Ce), gagarinite-(Y), ralstonite, gearksutite, molybdenite.

The name refers to Lake Gjerdingen nearby the first discovered occurrence and with the suffix -Fe to indicate the dominant cation in the D site.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more G minerals or help write this entry.