Mineral Factbook

Nacrite

Al2Si2O5(OH)4IMA symbol: Ncrgrandfathered

Nacrite is a silicate mineral with the formula Al2Si2O5(OH)4, crystallizing in the monoclinic system. It has a calculated density of 2.607 g/cm3.

Photos

Nacrite specimen photo
Mai Seppel · CC BY-SA 4.0 · Commons
Nacrite specimen photo
Ra'ike · CC BY-SA 3.0 · Commons
Nacrite specimen photo
Ra'ike · CC BY-SA 3.0 · Commons
Nacrite specimen photo
Mai Seppel · CC BY-SA 4.0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupC 1 c 1
Cell (Å, °)a = 8.91, b = 5.144, c = 14.593; α = 90, β = 100.5, γ = 90
Cell volume657.642 ų, Z = 4
Axial ratios1.7321:1:2.8369calculated from COD 9012666
Source structureCOD 9012666 (Crystallography Reports, 2008) — 1 of 4 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)7.1743.5874.1324.382.4072.435
I/I₀10063.551.242.534.634.6

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9012666; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.607 g/cm³calculated from COD 9012666

Chemistry (calculated)

Molecular weight258.16 g/molcalculated from the IMA formula
Composition (wt%)Al 20.9%, Si 21.76%, O 55.78%, H 1.56%

Classification

Nickel-Strunz (10th)9.ED.05Wikidata (CC0)
Nickel-Strunz (9th)9.ED.05Wikidata (CC0)