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Home > Laskowski Ⅶ – August 10 > MS1941 Gjerdingenite-Fe

Gjerdingenite-Fe - Sold

• Gjerdingselva
• Lunner
• Oppland
• Norway

• 3.1 × 1.6 × 1.4 cm – Thumbnail specimen (fits into a 2.5 cm cube)

Gjerdingenite-Fe is a hydrous potassium iron niobium silicate, and a member of the labuntsovite group (Chukanov et al. 2002). The mineral name recalls Lake Gjerdingen, near the type locality (Raade et al., 2002). Niobium silicates like gjerdingenite-Fe are much rarer than their titanium counterparts (i.e. labuntsovite-Fe).

Gjerdingenite-Fe forms tan laths with lorenzenite in a matrix of quartz, aegirine and feldspar. From the collection of E.R. Laskowski (1949-2020), a mining engineer who retired to Tucson, Arizona.