Fluorite
CaF2IMA symbol: Flrgrandfathered
Fluorite is a halide mineral with the formula CaF2, crystallizing in the cubic system. It has a Mohs hardness of 4, typically white, blue, brown or green in color, with a vitreous luster, a specific gravity of 3.01-3.25. Its streak is white.
Photos
Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | F m -3 m |
| Cell (Å, °) | a = 5.463209, b = 5.463209, c = 5.463209; α = 90, β = 90, γ = 90 |
| Cell volume | 163.059 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 2300449 |
| Source structure | COD 2300449 (Journal of Applied Crystallography, 2014) — 1 of 16 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 1.932 | 3.154 | 1.647 | 1.115 | 1.366 | 1.253 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 84.3 | 31.7 | 23.8 | 12.9 | 11.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 2300449; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.18 g/cm³calculated from COD 2300449 |
|---|---|
| Hardness (Mohs) | 4single sourceWikidata (CC0) 4single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.01-3.25 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | blue, brown, green, red, rose, violet, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 78.07 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 51.33%, F 48.67% |
Classification
| Nickel-Strunz (10th) | 3.AB.25Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 3.AB.25Wikidata (CC0) |
| Dana (8th) | 9.2.1.1Wikidata (CC0) |