Narsarsukite
Na2(Ti,Fe3+)Si4(O,F)11IMA symbol: Narapproved
Narsarsukite is a silicate mineral with the formula Na2(Ti,Fe3+)Si4(O,F)11, crystallizing in the tetragonal system. It has a Mohs hardness of 7, typically brown, gray or yellow in color, a specific gravity of 2.7. Its streak is brown.
Photos
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Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | I 4/m |
| Cell (Å, °) | a = 10.7269, b = 10.7269, c = 7.9476; α = 90, β = 90, γ = 90 |
| Cell volume | 914.502 ų, Z = 2 |
| Axial ratios | 1.0000:1:0.7409calculated from COD 9000110 |
| Source structure | COD 9000110 (American Mineralogist, 1962) |
Powder X-ray diffraction (calculated)
| d (Å) | 3.261 | 5.363 | 3.974 | 3.392 | 2.58 | 2.528 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 94 | 89.7 | 77 | 68.4 | 60.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000110; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.776 g/cm³calculated from COD 9000110 |
|---|---|
| Hardness (Mohs) | 7single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 2.7 g/cm3corroboratedFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | brown, gray, yellowsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | whitesingle sourceWikidata (CC0) brownsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Classification
| Nickel-Strunz (10th) | 9.DJ.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.DJ.05Wikidata (CC0) |
| Dana (8th) | 70.1.2.1Wikidata (CC0) |