Constituent
- Name
- Portlandite
- IMA name
- Portlandite
- Class
- non-silicate mineral
- Compound type
- oxide-hydroxide
- Relevance
- main - major
- Arrangement
- homogeneous in multi-phases
- Formula
- $Ca(OH)_2$
- Chemical formula
- Ca(OH)2
- Elemental formula
- Ca O2 H2
- Isotope mixture type
- terrestrial abundance
- Oxides
-
Formula $CaO$ $H_{2}O$ Mass fraction (%) 975.6 24.31
Strunz
- Class
- oxides - hydroxides - arsenites (04)
- Division
- hydroxides (without V or U) (04.F)
- Family
- Hydroxides with OH, without H2O; sheets of edge-sharing octahedral (04.FE)
- Code
- 04.FE.05
Dana
- Major class
- oxides and hydroxides (III)
- Class
- hydroxides and oxides containing hydroxyl (06)
- Type
- where X++ (OH)2 (06.02)
- Group
- Brucite group (Rhombohedral: P-3m1) (06.02.01)
- Code
- 06.02.01.04
- Phase type
- crystalline
- Crystal system
- trigonal
- Crystal class
- ditrigonal-scalenohedral
- Crystal class symbol
- -3m (D3d)
- Crystal spacegroup
- P-3m1
- Crystal sites
-
Label Nb Type Wp Specie Specie coordinence Specie occupancy Specie oxidation state Ca 1 main 1a-3m. $Ca^{2+}$ trigonal prismatic VI 1.0 2 O 2 main 6i.m. $O$ 1.0 -1 H 6 main 6i.m. $H$ linear I 0.333
- Molar mass
- 74.09 $g/mol$
- Density
- 2.227 - 2.233 $g/cm^3$
- Refringence type
- uniaxial
- Refringence sign
- negative
- Birefringence
- 0.027
- Refraction index $n_{\alpha}$
- 1.574
- Refraction index $n_{\beta}$
- 1.547
- Color
- light yellow
- Diaphaneity
- transparent
- Luster
- pearly