Mineral - Amicite
Amicite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
K₂Na₂Al₄Si₄O₁₆ · 5H₂O
Unit Cell
a=10.26 b=10.44 c=9.90 β=88° Z=2
Physical Properties
Hardness
4.5
Streak
white
Density
Normal (2-3,5)
Cleavage
nd
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
colorless
Birefringence
0.009
Luster
Vitreous
Transparency
transparent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-sphenoidal - 2
Space Group
C2 (5)
Habit
pyramidal, Tetrahedron
Formation
Volcanic, in nephelinite veins, in pegmatites
Paragenesis
Twinning
Penetration twins
Rarity
Rare
Synonyms
Amicite
Composition
Elements
Mass
SiO₂
36.38
Al₂O₃
29.46
Fe₂O₃
0.01
MgO
0.01
CaO
0.22
SrO
0.03
BaO
0.01
Na₂O
8.22
K₂O
12.96
H₂O
12.80
Germany (Alberti & Hentschel 1979)
Groups and Members
Zeolite-Supergroup
GIS-Zeolite-Group
Name and first discovery : Named after the Italian physicist Giovanni Battista Amici (1786-1863). First discovered in Germany in 1979.
Chemistry :
Synonyms :
Varieties :
Abbreviation : Ami
literature
Alberti, A., & Hentschel, G. (1979). Amicite—A new zeolite, New Year's Miner.