Constituent
- Name
- Hectorite
- IMA name
- Hectorite
- Class
- silicate mineral
- Compound type
- phyllosilicate
- Relevance
- main - major
- Arrangement
- single phase
- Mass fraction
- 1.0
- Formula
- $Na_{0.3}(Mg,Li)_3.Si_4O_{10}(OH)_2$
- Chemical formula
- Na0.3(Mg,Li)3Si4O10(OH)2
- Elemental formula
- (Na)0.3-0.5 (Mg)2.5-3 (Li)0-0.5 Si4 O12 H2
- Isotope mixture type
- terrestrial abundance
- Composition comments
- Typical formula: $Na_{0.4}(Mg_{2.7}Li_{0.3}).Si_4O_{10}(OH)_2$ - Common impurities: Ti, Al, Fe, Ca, K, Cl
- Oxides
-
Formula $Na_{2}O$ $MgO$ $Li_{2}O$ $SiO_{2}$ $H_{2}O$ Mass fraction (%)
Strunz
- Class
- silicates (09)
- Division
- phyllosilicate (09.E)
- Family
- Phyllosilicates 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.04
- Phase type
- crystalline
- Crystal system
- monoclinic
- Crystal class
- prismatic
- Crystal class symbol
- 2/m (C2h)
- Crystal spacegroup
- C2/m
- Texture
- monocrystalline
- Molar mass
- 383.25 $g/mol$
- Density
- 2 - 3 $g/cm^3$
- Refringence type
- biaxial
- Refringence sign
- negative
- Birefringence
- 0.030
- Refraction index $n_{\alpha}$
- 1.49
- Refraction index $n_{\beta}$
- 1.50
- Refraction index $n_{\gamma}$
- 1.52
- Color
- white
- Diaphaneity
- translucent to opaque
- Luster
- earthy