Table 1. Summary of Interplanar Distances Corresponding to MC-30, MC-60, and MC-120 Assigned to the Type of Iron Oxide and the Crystal Plane According to Cornell and Schwertmann⁵⁶.

	interplanar distance observed (nm/plane)	iron oxide	crystal plane
MC-30	0.2965 ± 0.0085	magnetite	{220}
	0.2424 ± 0.0074	magnetite	{222}
MC-60	0.2899 ± 0.0044	magnetite	{220}
	0.2517 ± 0.0060	magnetite	{311}
		wüstite	{111}
MC-120	0.2900 ± 0.0082	magnetite	{220}
	0.2508 ± 0.0040	magnetite	{311}
		wüstite	{111}