Formula: Na2(Ti,Fe)8O16
Origin of name: For Wilhelm Freudenberg, German geologist
Crystal system: Monoclinic pseudohexagonal
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Blackish
Diaphaneity: Transparent (apparent under microscope)
Luster:
Habit: Xenomorphic grains, tiny
Hardness:
Specific gravity: 4.30
Cleavage: 2; Basal and prismatic good
Tenacity:
Streak: Pale yellow-brown
Synonyms/varieties:
Comments:
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