Aegirine
NaFe3+Si2O6IMA symbol: Aegapproved
Aegirine is a silicate mineral with the formula NaFe3+Si2O6, crystallizing in the monoclinic system. It has a Mohs hardness of 6-6.5, typically black, brown, green or red in color, with a resinous or vitreous luster, a specific gravity of 3.5-3.55. Its streak is gray or yellow.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/c 1 |
| Cell (Å, °) | a = 9.6623, b = 8.8, c = 5.2956; α = 90, β = 107.579, γ = 90 |
| Cell volume | 429.248 ų, Z = 4 |
| Axial ratios | 1.0980:1:0.6018calculated from COD 9010326 |
| Source structure | COD 9010326 (American Mineralogist, 2007) — 1 of 31 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.987 | 2.899 | 2.524 | 6.363 | 2.469 | 2.546 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 47.4 | 39.1 | 39 | 37.4 | 25.3 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9010326; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.575 g/cm³calculated from COD 9010326 |
|---|---|
| Hardness (Mohs) | 6.3single sourceWikidata (CC0) 6-6.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.5-3.55 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, brown, green, redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | gray, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | resinous, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 9.DA.25Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.DA.25Wikidata (CC0) |
| Dana (8th) | 65.1.3c.2Wikidata (CC0) |