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Mineralpedia Details for Hiortdahlite

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Hiortdahlite

Hiortdahlite

Formula
Na4Ca8Zr2(Nb,Mn,Ti,Fe,Mg,Al)2(Si2O7)4O3F5 
Crystal System
Triclinic 
Crystal Habit
Tabular 
Cleavage
Distinct, Distinct, None 
Luster
Vitreous - Greasy 
Color
brown, colorless, yellow brown, honey yellow, light yellow 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle 
Hardness
5.5 
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Hiortdahlite from Novella quarry, near Pollena, Vesuvius, Campania, Italy

Hiortdahlite
            from Novella quarry, near Pollena, Vesuvius, Campania, Italy

Yellow acicular crystal to 1mm.

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Hiortdahlite from Langesundsfjord, Norway

Hiortdahlite
            from Langesundsfjord, Norway

Yellow embedded crystals to 8mm in nepheline syenite matrix. Garske labels, collected by him.

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