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Minerals - Okenite | TerraCollect
Mineral - Okenite
Okenite
Ca₁₀[Si₆O₁₆|(Si₆O₁₅)₂] · 18 H₂O
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Ca₁₀[Si₆O₁₆|(Si₆O₁₅)₂] · 18 H₂O
Unit Cell
a=9.69 b=7.28 c=22.02 α=93° β=100° γ=111° Z=2
Physical Properties
Hardness
4.5 - 5
Streak
white
Density
Normal (2-3,5)
Optical Properties
Color
white
colorless
Birefringence
0.010
Luster
Vitreous,
Pearly
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Composition
Elements
Mass
SiO₂
53.88
Al₂O₃
0.08
Fe₂O₃
0.01
CaO
27.61
SrO
0.27
Na₂O
0.12
K₂O
0.06
Karten-Ebenen
Geologische Karte
Satelliten Karte
Cleavage
Perfect after {001}
Fracture
Tenacity
Elastic-flexible
Point Group
triclinic-pinacoidal -
1
Space Group
P
1
(2)
Habit
fibrous,
felted,
hair-like,
spherical,
acicular,
radial
Formation
Hydrothermal as a secondary mineral formed by precipitation from silica-rich, calcium-containing solutions in cavities (vugs/geodes) within basaltic rocks
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Okenite
H₂O
18.02
India (Dana 1895)
