Formula: NaFe3Fe6(BO3)3(Si6O18)(O,OH)4
Origin of name: for Pavel Povondra, Czech geochemist
Crystal system: hexagonal
Crystal class: 3m
Twinning:
Unit cell:
Colour: black
Diaphaneity:
Luster: resinous
Habit: crystals malformed, nearly equant habit, in subparallel aggregates
Hardness: 7
Specific gravity: 3.26
Cleavage: none
Tenacity:
Streak: brown
Synonyms/varieties:
Comments: povondraite is a redefinition of ferridravite
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