Formula: (Na,K)2(Mg,Fe)5Si12O30
Origin of name: for Edwin W. Roedder, American geologist
Crystal system: hexagonal
Crystal class: -6m2
Twinning:
Unit cell:
Colour: colourless
Diaphaneity:
Luster: vitreous
Habit: flat plates, minute crystals
Hardness:
Specific gravity: about 2.6
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with eifelite, from a few meteorites and in Germany
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