Mineral Factbook

Dickite

Al2Si2O5(OH)4IMA symbol: Dckgrandfathered

Dickite is a silicate mineral with the formula Al2Si2O5(OH)4, crystallizing in the monoclinic system. It has a calculated density of 2.619 g/cm3. Its streak is white.

Photos

Dickite specimen photo
Chris Emproto · CC BY 3.0 · Commons
Dickite specimen photo
John Sobolewski (JSS) · CC BY 3.0 · Commons
Dickite specimen photo
John Sobolewski (JSS) · CC BY 3.0 · Commons
Dickite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupC 1 c 1
Cell (Å, °)a = 5.1375, b = 8.9178, c = 14.389; α = 90, β = 96.74, γ = 90
Cell volume654.679 ų, Z = 4
Axial ratios0.5761:1:1.6135calculated from COD 9013939
Source structureCOD 9013939 (Neues Jahrbuch fur Mineralogie, Monatshefte, 1986) — 1 of 5 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)7.1453.5724.1132.3193.7834.357
I/I₀10067.158.255.643.434.7

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9013939; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.619 g/cm³calculated from COD 9013939
Streak
whitesingle sourceWikidata (CC0)

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)