Formula: (K,Ba)(Ti,Fe)8O16
Origin of name: for Rex Prider, Australian geologist
Crystal system: tetragonal
Crystal class: 4/m
Twinning:
Unit cell:
Colour: black, reddish
Diaphaneity:
Luster: adamantine
Habit: stout rectangular prisms, lamellar structure, to 1 mm, rods 0.5 mm
Hardness:
Specific gravity: 3.86
Cleavage: 2; basal, perfect, parallel to prism, fair
Tenacity:
Streak: gray
Synonyms/varieties:
Comments:
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