Milarite

Formula:  K₂Ca₄Al₂Be₄Si₂₄O₆₀ ^. H₂O

Origin of name:  From locality (incorrect); Val Milar, Switzerland

Crystal system:  Hexagonal

Crystal class:  6/m 2/m 2/m

Twinning: 

Unit cell: a = 10.42 Å, c = 13.8 Å

Colour:  Colourless, pale green, yellowish green

Diaphaneity: 

Luster:  Vitreous

Habit:  Crystals prismatic

Hardness:  5.5 to 6

Specific gravity:  2.46 to 2.61

Cleavage:  None

Tenacity:  Conchoidal to uneven; brittle

Streak: 

Synonyms/varieties:

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