Eifelite

Formula:   KNa₃Mg₄Si₁₂O₃₀

Origin of name:   After locality; Eifel district, Rhineland-Palatinate, Germany

Crystal system:   Hexagonal

Crystal class:   622

Twinning:

Unit cell: 

Colour:  Colourless to faint yellow, green

Diaphaneity:

Luster:   Vitreous

Habit:   Crystals platy, tiny

Hardness:

Specific gravity:   2.67

Cleavage:   None

Tenacity: 

Streak:   White

Synonyms/varieties:

Comments:   Series with roedderite