Mineral phase
- IMA name
- Lizardite 1T
- Secondary names
- Orthoantigorite
- Class
- silicate mineral
- Compound type
- phyllosilicate
- Comments
- 2 others known polytypes: $2H_1$: hexagonal 6mm (P6(3)cm), 6A: ?
- Formula
- $Mg_3.Si_2O_5(OH)_4$
- Chemical formula
- Mg3Si2O5(OH)4
- Elemental formula
- Mg3 Si2 O9 H4
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $MgO$ $SiO_{2}$ $H_{2}O$ Mass fraction (%) 43.63 43.36 13.0
Strunz
- Class
- silicates (09)
- Division
- phyllosilicate (09.E)
- Family
- with kaolinite layers composed of tetrahedral and octahedral nets (09.ED)
- Code
- 09.ED.15
Dana
- Major class
- silicates (VIII)
- Class
- phyllosilicate sheets of six-membered rings (71)
- Type
- with 1:1 layers (71.01)
- Group
- Serpentine group (Lizardite subgroup) (71.01.02b)
- Code
- 71.01.02b.02
- Phase type
- crystalline
- Crystal system
- trigonal
- Crystal class
- ditrigonal-pyramidal
- Crystal class symbol
- 3m (C3v)
- Crystal spacegroup
- P31m
- Molar mass
- 277.11 $g/mol$
- Density
- 2.55 - 2.6 $g/cm^3$
- State NTP
- solid
- Refringence type
- biaxial
- Refringence sign
- negative
- Birefringence
- 0.0055 - 0.012
- Refraction index $n_{\alpha}$
- 1.541 - 1.5625
- Refraction index $n_{\beta}$
- 1.565
- Refraction index $n_{\gamma}$
- 1.553 - 1.568
- Dispersion V
- weak to distinct
- Pure color
- white
- Color
- green, green blue, yellow, white
- Diaphaneity
- translucent
- Luster
- waxy