Mineral Factbook

Glauberite

Na2Ca(SO4)2IMA symbol: Glbgrandfathered

Glauberite is a sulfate mineral with the formula Na2Ca(SO4)2, crystallizing in the monoclinic system. It has a Mohs hardness of 2.5-3, typically gray, red or yellow in color, with a vitreous luster, a specific gravity of 2.7-2.85. Its streak is white.

Photos

Glauberite specimen photo
Didier Descouens · CC BY-SA 4.0 · Commons
Glauberite specimen photo
Internet Archive Book Images · No restrictions · Commons
Glauberite specimen photo
Mai Seppel · CC BY-SA 4.0 · Commons
Glauberite specimen photo
Mai Seppel · CC BY-SA 4.0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupC 1 2/c 1
Cell (Å, °)a = 10.129, b = 8.306, c = 8.533; α = 90, β = 112.19, γ = 90
Cell volume664.724 ų, Z = 4
Axial ratios1.2195:1:1.0273calculated from COD 9000154
Source structureCOD 9000154 (American Mineralogist, 1967) — 1 of 2 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)3.1773.1272.8092.6783.1093.951
I/I₀10095.293.484.68070.5

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000154; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.78 g/cm³calculated from COD 9000154
Hardness (Mohs)
2.5-3single sourceDana, System of Mineralogy, 6th ed. (1892)
Specific gravity
2.7-2.85 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892)
Color
gray, red, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892)
Streak
whitesingle sourceWikidata (CC0)
whitesingle sourceDana, System of Mineralogy, 6th ed. (1892)
Luster
vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892)

Chemistry (calculated)

Molecular weight278.18 g/molcalculated from the IMA formula
Composition (wt%)Na 16.53%, Ca 14.41%, S 23.05%, O 46.01%

Classification

Nickel-Strunz (10th)7.AD.25Wikidata (CC0)
Nickel-Strunz (9th)7.AD.25Wikidata (CC0)
Dana (8th)28.4.2.1Wikidata (CC0)