Mineral - Chabazite-(Ca)
Chabazite-(Ca)
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Ca,K₂,Na₂)₂[Al₂Si₄O₁₂]₂ · 12H₂O
Unit Cell
a=13.79 c=15.04 Z=1
Physical Properties
Hardness
4 - 5
Streak
white
Density
Normal (2-3,5)
Cleavage
Distinct after {10 1 1}
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
whiteredorangeyellowpinkcolorless
Birefringence
0.005
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
triclinic-pinacoidal - 1
Space Group
P 1 (2)
Habit
massive, Rhombohedron, Cube
Formation
In clefts and cavities of volcanic rocks due to the interaction with hydrothermal solutions at low temperatures
Paragenesis
Twinning
Interpenetrational twins after {0001}
Rarity
Common
Synonyms
Chabazite-(Ca), Chabazite
Composition
Elements
Mass
SiO₂
47.56
Al₂O₃
20.40
MgO
0.20
CaO
10.52
Na₂O
0.32
K₂O
0.92
H₂O
19.72
USA (Dana 1892)
Groups and Members
Zeolite-Supergroup
Chabazite-Levyne-Group
Chabazite-Subgroup