Mineralpedia Details for 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
- WebMineral
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Hiortdahlite from Novella quarry, near Pollena, Vesuvius, Campania, Italy
Yellow acicular crystal to 1mm.
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Hiortdahlite from Langesundsfjord, Norway
Yellow embedded crystals to 8mm in nepheline syenite matrix. Garske labels, collected by him.
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