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   Polylithonite
(KLi2AlSi4O10(F,OH)2)
NS3947
  
Image: NS3947.jpg
Detail: NS3947detail.jpg

 
Crystal system monoclinic
Habit flat, pseudo-hexagonal, plate like leaflets that are stacked.
Cleavage perfect.
Fracture conchoidal.Parting - good, along the plate faces.
Hardness 6.5
Specific Gravity 2.8
Color colorless, silvery, pale brown or pale yellow/brown.
Luster pearly.
Streak dark brown.
Distinguishing features mica look, stacked habit and color.
Uses of interest to scientists and collectors.







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