Table 1: Complex refractive indices ( $m=n+{\rm i}~k$ ) at a wavelength $\lambda$ for candidate constituent materials.
Material m at $\lambda =450$ nm m at $\lambda =600$ nm Reference

Magnesium-rich olivine $1.69+ {\rm i}~1.04\times{10}^{-4}$ $1.68+ {\rm i}~1.15\times{10}^{-5}$ Huffman (1976)

Organic refractory $1.91+{\rm i}~3.17\times{10}^{-1}$ $1.97+{\rm i}~2.79\times{10}^{-1}$ Li & Greenberg (1997)

Amorphous carbon $1.95+{\rm i}~7.86\times{10}^{-1}$ $2.14+{\rm i}~8.05\times{10}^{-1}$ Rouleau & Martin (1991)

Pyrrhotite $1.45+{\rm i}~1.53$ $1.70+{\rm i}~1.86$ Egan & Hilgeman (1977)

**Table 1:** Complex refractive indices ( $m=n+{\rm i}~k$ ) at a wavelength $\lambda$ for candidate constituent materials.
Material	m at $\lambda =450$ nm	m at $\lambda =600$ nm	Reference
Magnesium-rich olivine	$1.69+ {\rm i}~1.04\times{10}^{-4}$	$1.68+ {\rm i}~1.15\times{10}^{-5}$	Huffman (1976)
Organic refractory	$1.91+{\rm i}~3.17\times{10}^{-1}$	$1.97+{\rm i}~2.79\times{10}^{-1}$	Li & Greenberg (1997)
Amorphous carbon	$1.95+{\rm i}~7.86\times{10}^{-1}$	$2.14+{\rm i}~8.05\times{10}^{-1}$	Rouleau & Martin (1991)
Pyrrhotite	$1.45+{\rm i}~1.53$	$1.70+{\rm i}~1.86$	Egan & Hilgeman (1977)

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