Mineral Factbook

Trona

Na3(HCO3)(CO3)·2H2OIMA symbol: Tngrandfathered

Trona is a carbonate or nitrate mineral with the formula Na3(HCO3)(CO3)·2H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 2.5-3, typically white, gray or yellow in color, with a vitreous luster, a specific gravity of 2.11-2.14. Its streak is white.

Photos

Trona specimen photo
Martin D. Adamiker · CC BY-SA 4.0 · Commons
Trona specimen photo
Mmaua1 · CC BY-SA 4.0 · Commons
Trona specimen photo
Mds08011 · CC BY 4.0 · Commons
Trona specimen photo
James St. John · CC BY 2.0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupC 1 2/c 1
Cell (Å, °)a = 20.36, b = 3.48, c = 10.29; α = 90, β = 106.48, γ = 90
Cell volume699.124 ų, Z = 4
Axial ratios5.8506:1:2.9569calculated from COD 9007656
Source structureCOD 9007656 (Acta Crystallographica, Section B, 1982) — 1 of 2 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)2.6383.0632.4343.0482.2459.762
I/I₀10042.733.82624.924.1

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9007656; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.147 g/cm³calculated from COD 9007656
Hardness (Mohs)
2.5-3single sourceDana, System of Mineralogy, 6th ed. (1892)
Specific gravity
2.11-2.14 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892)
Color
gray, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892)
Streak
whitesingle sourceWikidata (CC0)
Luster
vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892)

Chemistry (calculated)

Molecular weight226.03 g/molcalculated from the IMA formula
Composition (wt%)Na 30.51%, H 2.23%, C 10.63%, O 56.63%

Classification

Nickel-Strunz (10th)5.CB.15Wikidata (CC0)
Nickel-Strunz (9th)5.CB.15Wikidata (CC0)