Mineral Factbook

Antigorite

Mg3Si2O5(OH)4IMA symbol: Atgredefined

Antigorite is a silicate mineral with the formula Mg3Si2O5(OH)4, crystallizing in the monoclinic system. It has a calculated density of 2.577 g/cm3.

Photos

Antigorite specimen photo
J. Patrick Fischer · CC BY-SA 4.0 · Commons
Antigorite specimen photo
Rhurlow · CC BY-SA 4.0 · Commons
Antigorite specimen photo
Ringwoodit · CC BY-SA 4.0 · Commons
Antigorite specimen photo
Adam Ognisty · CC BY 3.0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupP 1 m 1
Cell (Å, °)a = 43.505, b = 9.251, c = 7.263; α = 90, β = 91.32, γ = 90
Cell volume2922.33 ų, Z = 1
Axial ratios4.7027:1:0.7851calculated from COD 9003103
Source structureCOD 9003103 (American Mineralogist, 2004) — 1 of 3 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)7.2612.5252.5273.6252.1693.611
I/I₀10096.854.240.84036.2

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9003103; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.577 g/cm³calculated from COD 9003103

Chemistry (calculated)

Molecular weight277.11 g/molcalculated from the IMA formula
Composition (wt%)Mg 26.31%, Si 20.27%, O 51.96%, H 1.45%

Classification

Nickel-Strunz (10th)9.ED.15Wikidata (CC0)
Nickel-Strunz (9th)9.ED.15Wikidata (CC0)