Aeschynite-(Ce)
(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6IMA symbol: Aes-Cerenamed
Aeschynite-(Ce) is an oxide or hydroxide mineral with the formula (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6, crystallizing in the orthorhombic system. It has a Mohs hardness of 5-6, typically black, brown or yellow in color, with a dull or metallic luster, a specific gravity of 4.93. Its streak is black or brown.
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P b n m |
| Cell (Å, °) | a = 5.37, b = 11.08, c = 7.56; α = 90, β = 90, γ = 90 |
| Cell volume | 449.817 ų, Z = 4 |
| Axial ratios | 0.4847:1:0.6823calculated from COD 9009529 |
| Source structure | COD 9009529 (Doklady Akademii Nauk SSSR, 1962) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.977 | 3.043 | 3.122 | 1.606 | 1.717 | 2.036 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 69.2 | 27.1 | 22.7 | 21.9 | 20.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009529; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 5.11 g/cm³calculated from COD 9009529 |
|---|---|
| Hardness (Mohs) | 5-6single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.93 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, brown, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | black, brown, gray, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | dull, metallic, resinous, submetallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 4.DF.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.DF.05Wikidata (CC0) |