Mineral - Analcime
Analcime
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Na[AlSi₂O₆]·H₂O
Unit Cell
a=13.73 Z=16
Physical Properties
Hardness
5 - 5.5
Streak
white
Density
Normal (2-3,5)
Cleavage
Indistinct after {100}
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
whitegrayredorangecolorless
Birefringence
0.001
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
triclinic-pedial - 1
Space Group
P1 (1)
Habit
Deltoidal icositetrahedron
Formation
In cavities (amygdules) of volcanic rocks (e.g. basalts, phonolites) due to hydrothermal or deuteric alteration
Paragenesis
Twinning
Polysynthetic twins on (001) and (110)
Rarity
Common
Synonyms
Analcime
Composition
Elements
Mass
SiO₂
54.19
Al₂O₃
23.12
MgO
0.10
CaO
1.54
Na₂O
11.08
K₂O
1.62
H₂O
8.20
Italy (Dana 1892)
Groups and Members
Zeolith-Supergroup
ANA-Zeolite-Subgroup
Name and first discovery : Named after the Greek word "analkimos" which means "weak", in reference to the weak electrical charge when heated (pyroelectric effect).
Chemistry :
Synonyms : analcite, analcidite, analcin, analzime, cubicite, cubicite, cuboite, eudnophite, euthallite
Varieties : Cesium Analcime, Cluthalite, Germanium Analcime
Abbreviation : Anl
literature
Dana, J. D., & Dana, E. S. (1892). The system of mineralogy of James Dwight Dana, 1837-1868: descriptive mineralogy . J. Wiley & sons.