Sodalite
Na4(Si3Al3)O12ClIMA symbol: Sdlgrandfathered
Sodalite is a silicate mineral with the formula Na4(Si3Al3)O12Cl, crystallizing in the cubic system. It has a Mohs hardness of 5.5-6, typically white, blue, gray or green in color, with a greasy or vitreous luster, a specific gravity of 2.14-2.5. Its streak is red.
Photos
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Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | P -4 3 n |
| Cell (Å, °) | a = 8.880679, b = 8.880679, c = 8.880679; α = 90, β = 90, γ = 90 |
| Cell volume | 700.388 ų, Z = 2 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9013320 |
| Source structure | COD 9013320 (The Canadian Mineralogist, 2008) — 1 of 25 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.626 | 2.093 | 6.28 | 2.373 | 2.564 | 1.441 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 34.8 | 31.7 | 22.6 | 18.5 | 13 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9013320; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.298 g/cm³calculated from COD 9013320 |
|---|---|
| Hardness (Mohs) | 6single sourceWikidata (CC0) 5.5-6single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.14-2.5 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | blue, gray, green, red, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | greasy, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 484.61 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Na 18.98%, Si 17.39%, Al 16.7%, O 39.62%, Cl 7.32% |
Classification
| Nickel-Strunz (10th) | 9.FB.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.FB.10Wikidata (CC0) |
| Dana (8th) | 76.2.3.1Wikidata (CC0) |