Formula: Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6.2H2O
Origin of name: from natrium = sodium and dufrenite
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: bronze-green, pale blue-green
Diaphaneity:
Luster:
Habit: spheres to 0.5 cm, compact radiating fibers
Hardness:
Specific gravity: 3.23
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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