Mineral Information and Data:

Amicite
K2Na2(Si4Al4)O16 • 5H2O [CNMNC approved formula]

Named to honor Giovan Battista Amici (1786-1863), physicist, optician, and inventor of microscope optical elements.

IMA status : Approved Species 1979 (IMA1979-011)
CLASSIFICATION 
Dana
(8th edition) :
77.01.03.02  
  (77) Tectosilicate Zeolite group
  (77.01) true zeolites
  (77.01.03) Gismondine and related species
  
Nickel-Strunz
(10th edition) :
09.GC.05
  (09) Silicates
  (09.G) Tektosilicates with Zeolitic H2O
  (09.GC) Chains of doubly-connected 4-membered rings
  
Crystal system: Monoclinic System
Point group (H-M): 2 — sphenoidal
Unit cell: a = 10.26 Å, b = 10.43 Å, c = 9.90 Å, b = 89°
Crystal Habit: Radial aggregates of 100-200 um crystals
  
Color: Colorless
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 4.5
Measured Density: 2.06-2.23 g/cm3
Streak: White
  
Geologic Setting: In veinlets cutting melilite-nephelinite volcanic rocks and pyroclastics (Hegau, Germany); in natrolite veinlets cutting ijolite-urtite pegmatites and apatite-nepheline rocks (Kola Peninsula, Russia).
Mineral Association: Merlinoite, aragonite, calcite (Hegau, Germany); natrolite (Kola Peninsula, Russia)
  

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