Calcium Aluminium Silicate (Zeolite)
(CaAl2Si3O10)*3H2O
Chemical name
Calcium Aluminium Silicate (Zeolite)
Mineral name
Scolecite
Chemical formula
(CaAl2Si3O10)*3H2O
Crystal system
monoclinic
Crystal Class
monoclinic-domatic (m)
Space Group
Cc
Unit cell
a [Å]:18.51
b [Å]:18.97
c [Å]:6.53
Formula units
Z=8
Frequent crystal surfaces
{010}, {110}, {111}
Twinning
on [001] pseudorhomohedral contact- and penetration twinning, on {010} lamellar
Mohs hardness
5 - 5.5
Density [g/cm3]
~2.3
Cleavage
perfect on {110} and {1-10}
Fracture / Tenacity
uneven, brittle
Color
colorless to white, pink, salmon, red or green
Streak
white
Transparency
transparent to translucent
Optical character
biaxial (-)
Refractive Index
nα=1.507-1.513; nβ=1.516-1.520; nΥ=1.517-1.521
Birefringence δ
0.010
Other
pyroelectric and piezoelectric