Zircon
Zr(SiO4)IMA symbol: Zrngrandfathered
Zircon is a silicate mineral with the formula Zr(SiO4), crystallizing in the tetragonal system. It has a Mohs hardness of 7.5, typically colorless, brown, gray or green in color, with an adamantine luster, a specific gravity of 4.68-4.7. Its streak is red.
Photos
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Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | I 41/a m d :2 |
| Cell (Å, °) | a = 6.6102, b = 6.6102, c = 5.986; α = 90, β = 90, γ = 90 |
| Cell volume | 261.557 ų, Z = 4 |
| Axial ratios | 1.0000:1:0.9056calculated from COD 9002554 |
| Source structure | COD 9002554 (American Mineralogist, 2001) — 1 of 23 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.305 | 2.521 | 1.714 | 4.437 | 2.068 | 1.382 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 58.2 | 54.8 | 43.2 | 20.6 | 17.5 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9002554; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.655 g/cm³calculated from COD 9002554 |
|---|---|
| Hardness (Mohs) | 7.5single sourceWikidata (CC0) 7.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.68-4.7 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, colorless, gray, green, red, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantinesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 183.31 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Zr 49.77%, Si 15.32%, O 34.91% |
Classification
| Nickel-Strunz (10th) | 9.AD.30Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.AD.30Wikidata (CC0) |
| Dana (8th) | 51.5.2.1Wikidata (CC0) |