Polylithionite

Formula: KLi2AlSi4O10(F,OH)2

Origin of name: from Greek for many and from lithium

 

Crystal system: monoclinic

Crystal class: 2/m

Twinning: 

Unit cell: a = 5.19 Å, b = 8.97 Å, c = 10.03 Å, b = 100.4°

 

Colour: white, pink, cream, greenish, bluish

Diaphaneity: 

Luster: pearly

Habit: crystals tabular, hexahedral, to 5 cm, scaly aggregates, massive, cryptocrystalline, pseudomorphs of monoclinic natrolite

Hardness: 2 to 3

Specific gravity: 2.58 to 2.76

Cleavage: 1; {001} perfect

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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