Chiolite
Na5Al3F14IMA symbol: Ciograndfathered
Chiolite is a halide mineral with the formula Na5Al3F14, crystallizing in the tetragonal system. It has a Mohs hardness of 3-3.5, typically black or green in color, with a vitreous luster, a specific gravity of 2.84-2.9. Its streak is green; cleavage is distinct or perfect.
Photos
Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 4/m n c |
| Cell (Å, °) | a = 7.0138, b = 7.0138, c = 10.402; α = 90, β = 90, γ = 90 |
| Cell volume | 511.71 ų, Z = 2 |
| Axial ratios | 1.0000:1:1.4831calculated from COD 9012139 |
| Source structure | COD 9012139 (Journal of Solid State Chemistry, 1981) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.908 | 2.326 | 1.795 | 1.753 | 1.502 | 5.201 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 56.1 | 36.5 | 30.5 | 29.3 | 27.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9012139; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.998 g/cm³calculated from COD 9012139 |
|---|---|
| Hardness (Mohs) | 3-3.5single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 2.84-2.9 g/cm3Ford, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | black, greensingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | greensingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | vitreoussingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Cleavage | distinct, perfectFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Chemistry (calculated)
| Molecular weight | 461.87 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Na 24.89%, Al 17.53%, F 57.59% |
Classification
| Nickel-Strunz (10th) | 3.CE.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 3.CE.05Wikidata (CC0) |