Mineral Factbook

Langbeinite

K2Mg2(SO4)3IMA symbol: Lbngrandfathered

Langbeinite is a sulfate mineral with the formula K2Mg2(SO4)3, crystallizing in the cubic system. It has typically colorless in color, a specific gravity of 1.477.

Photos

Langbeinite specimen photo
Darla Sondrol · CC0 · Commons
Langbeinite specimen photo
Pekov, I.V.; Sandalov, F.D.; Koshlyakova, N.N.; Vigasina, M.F.; Polekhovsky, Y.S.; Britvin, S.N.; Sidorov, E.G.; Turchkova, A.G. · CC BY 4.0 · Commons
Langbeinite specimen photo
Andrey Butko · CC BY-SA 3.0 · Commons
Langbeinite specimen photo
Зеленский Михаил Евгеньевич · CC BY-SA 4.0 · Commons

Crystallography

Crystal systemcubic crystal systemWikidata (CC0)
Space groupP 21 3
Cell (Å, °)a = 10.1073, b = 10.1073, c = 10.1073; α = 90, β = 90, γ = 90
Cell volume1032.54 ų, Z = 4
Axial ratios1.0000:1:1.0000calculated from COD 9005867
Source structureCOD 9005867 (Physics and Chemistry of Minerals, 1988) — 1 of 7 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)3.1962.7011.641.9823.0472.063
I/I₀10048.117.21613.311.5

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9005867; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)3.064 g/cm³calculated from COD 9005867
Specific gravity
1.477 g/cm3single sourceDana's System, 2nd Appendix (1909)
Color
colorlessFord, Dana's Textbook of Mineralogy, 3rd ed. (1922)

Chemistry (calculated)

Molecular weight414.99 g/molcalculated from the IMA formula
Composition (wt%)K 18.84%, Mg 11.71%, S 23.18%, O 46.26%

Classification

Nickel-Strunz (10th)7.AC.10Wikidata (CC0)
Nickel-Strunz (9th)7.AC.10Wikidata (CC0)
Dana (8th)28.4.4.1Wikidata (CC0)