(Na,Ca)2Ca4Zr(Mn,Ti,Fe)(Si2O7)2(F,O)4  to Wöhlerite group

 

Hiortdahlite is very near linked to Wöhlerite and Lavenite (additional Fe & Mn). Differences in glancing angles helps to make a better separation in analyses.

The crystals are in radial form but a bit divergent.

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Further examinations for more details will be done.