Polycrase-(Y)
Y(Ti,Nb)2(O,OH)6IMA symbol: Plc-Ydiscredited
Polycrase-(Y) is an oxide or hydroxide mineral with the formula Y(Ti,Nb)2(O,OH)6. It has a Mohs hardness of 5-6, typically black or brown in color, with a resinous or vitreous luster, a specific gravity of 4.97-5.04. Its streak is brown or gray.
Photos
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Crystallography
| Space group | P b c n |
|---|---|
| Cell (Å, °) | a = 14.6673, b = 5.5925, c = 5.1888; α = 90, β = 90, γ = 90 |
| Cell volume | 425.621 ų, Z = 8 |
| Axial ratios | 2.6227:1:0.9278calculated from COD 9011761 |
| Source structure | COD 9011761 (Neues Jahrbuch fur Mineralogie, Monatshefte, 1999) |
Powder X-ray diffraction (calculated)
| d (Å) | 3.002 | 1.779 | 1.498 | 1.84 | 3.681 | 2.796 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 12.4 | 12.1 | 11.8 | 11.6 | 10.5 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011761; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 5.072 g/cm³calculated from COD 9011761 |
|---|---|
| Hardness (Mohs) | 5-6single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.97-5.04 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, brownsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | brown, graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | resinous, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 4.DG.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.DG.05Wikidata (CC0) |