Constituent
Name
Mg-exchanged saponite SAP size-fraction <2 µm
IMA name
Saponite
Class
silicate mineral
Compound type
phyllosilicate
Comments
Chemical composition and molecular mass are per half unit cell
Relevance
main - major
Arrangement
homogeneous in multi-phases
Mass fraction
1.0 0.05
Formula
Chemical formula
(Na,Ca0.5)0.3(Mg,Fe2+)3(Si,Al)4O10(OH)2•4(H2O)
Elemental formula
(Al)0.58-1.5 (Mg)3.29-3 (Si)3.42-4 (O)12-16 (H)2-10
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
Aluminium element 0.58 - 1.5 1.0 constituent element main
Magnesium element 3.29 - 3 1.0 constituent element main
Silicon element 3.42 - 4 1.0 constituent element main
Oxygen element 12 - 16 1.0 constituent element main
Hydrogen element 2 - 10 1.0 constituent element main
Composition comments
Typical formula: - Common impurities: Ti, Mn, Ni, K, P - Intermolecular water was not taken into account in atomic composition calculation
Chemical functions
  Function Number
2
Chemical bonds
  Bond Number
1
Oxides
Formula
Mass fraction (%) 53.28 7.62 34.39 4.67

Strunz

Class
silicates (09)
Division
phyllosilicate (09.E)
Family
with mica sheets, composed of tetrahedral and octahedral nets (09.EC)
Code
09.EC.45

Dana

Major class
silicates (VIII)
Class
phyllosilicate sheets of six-membered rings (71)
Type
with 2:1 clays (71.03)
Group
Smectite group (Trioctahedral Smectites) (71.03.01b)
Code
71.03.01b.02
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
C2/m
Texture
cryptocrystalline
Molar mass
385.0
Density
N/A
Refringence type
biaxial
Refringence sign
negative
Birefringence
0.032 - 0.037
Refraction index
1.479 - 1.49
Refraction index
1.51 - 1.525
Refraction index
1.511 - 1.527
Color
white, yellowish white, greenish white, reddish white, bluish white
Diaphaneity
subtranslucent to opaque
Luster
N/A