Hiortdahlite type I - Arøya (Arö; Store Arøya), Langesundsfjorden, Larvik, Vestfold, Norway

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Hiortdahlite type I - Arøya (Arö; Store Arøya), Langesundsfjorden, Larvik, Vestfold, Norway (#:MINS8931)

Specimen with yellow pseudotetragonal crystals up to 11 mm long with annite crystals in association on matrix. A rare Zr,Ti silicate.

Formula :
(Ca,Na)₃(Zr,Ti,Y)[(O,F,OH)₂/Si₂O₇
System: triclinic Hardness:5½ Rarity:rare
Strunz id:VIII/C.11-50 - SILICATES
Name origin: Named by W.C. Brögger in 1890 in honor of Thorstein Hallager Hiortdahl (04 May 1839, Bergen, Norway - 29 October 1925, Oslo, Norway), chemist, mineralogist, crystallographer, and politician.

Specimen weight:24 gr.

Crystal size:up to 11 mm

Overall size: 35mm x 24 mm x 20 mm

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Hiortdahlite type I - Arøya (Arö; Store Arøya), Langesundsfjorden, Larvik, Vestfold, Norway

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