Table 1.

Comparison of X-ray diffraction data for various mackinawite phases

hkl	Synthetic Mka		Synthetic MkAb		Synthetic MkBb		Crystalline Mkc
	d (Å)	I/Io (%)	d (Å)	I/Io (%)	d (Å)	I/Io (%)	d (Å)	I/Io (%)
001	5.196	100	6.60	100	5.48	100	5.0328	100
101	2.989	42	3.33	51	3.36	41	2.9672	50
110	2.617	4	2.84	27	2.58	7	2.5976	8
111	2.323	38	2.42	41	2.3	47	2.3082	70
200	1.845	37	2.00	35	1.95	10	1.8368	38
112	1.809	92	1.88	52	1.83	29	1.8074	82
201	1.730	19	1.77	50	1.73	23	1.7254	29
003			1.84	44	1.81	30	1.6776	9
211	1.579	16	1.63	21	1.57	12	1.5617	12
103							1.5260	6
220	1.306	14					1.2988	11

^aNon-magnetic portion of synthetic mackinawite aged for 3 days (this study).

^bSynthetic mackinawite aged for < 0.5 h (Wolthers et al., 2003).

^cWell-crystalline mackinawite (Lennie at al., 1995).