Portlandite Ca(OH)2 IMA symbol: Por grandfathered
Portlandite is an oxide or hydroxide mineral with the formula Ca(OH)2, crystallizing in the trigonal system. It has a calculated density of 2.246 g/cm3.
Crystallography Crystal system trigonal crystal systemWikidata (CC0) Space group P -3 m 1 Cell (Å, °) a = 3.589, b = 3.589, c = 4.911; α = 90, β = 90, γ = 120 Cell volume 54.8 ų, Z = 1 Axial ratios 1.0000:1:1.3683calculated from COD 1001788 Source structure COD 1001788 (Acta Crystallographica B (39,1983-), 1993) — 1 of 16 structures
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 2.626 4.911 1.927 1.794 3.108 1.686 I/I₀ 100 60.2 45.1 30.1 16.8 16.6
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 1001788; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 2.246 g/cm³calculated from COD 1001788
Chemistry (calculated) Molecular weight 74.09 g/molcalculated from the IMA formula Composition (wt%) Ca 54.09%, O 43.19%, H 2.72%
Classification Nickel-Strunz (10th) 4.FE.05Wikidata (CC0) Nickel-Strunz (9th) 4.FE.05Wikidata (CC0)
