Radekškodaite-(La) (original) (raw)
RI values:
_n_α = 1.790(7) _n_β = 1.798(5) _n_γ = 1.825(8)
2V:
Measured: 60° (10), Calculated: 58°
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Bireflectance:
Very weak, ΔR = 0.2% (589 nm)
Reflectivity:
| Wavelength | R1 | R2 |
|---|---|---|
| 400nm | 8.9% | 8.7% |
| 420nm | 8.8% | 8.6% |
| 440nm | 8.7% | 8.5% |
| 460nm | 8.6% | 8.5% |
| 470nm | 8.6% | 8.4% |
| 480nm | 8.6% | 8.4% |
| 500nm | 8.6% | 8.4% |
| 520nm | 8.6% | 8.4% |
| 540nm | 8.5% | 8.4% |
| 546nm | 8.5% | 8.4% |
| 560nm | 8.5% | 8.3% |
| 580nm | 8.5% | 8.3% |
| 589nm | 8.5% | 8.3% |
| 600nm | 8.5% | 8.3% |
| 620nm | 8.5% | 8.3% |
| 640nm | 8.4% | 8.3% |
| 650nm | 8.4% | 8.3% |
| 660nm | 8.4% | 8.3% |
| 680nm | 8.4% | 8.3% |
| 700nm | 8.4% | 8.2% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 8.9%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Dark gray
Internal Reflections:
Whitish
Comments:
Marsh green hues with the absorption scheme Z > Y > X. Sometimes brownish tints.