Table 1.

Comparison of theoretical d spacing corresponding to gypsum and anhydrite and those directly measured on figures 4 B, D, F, and H in Huang et al. (1)

SAED patterns	Indicated	Theoretical d*	Measured	Δ Theoretical − Measured
Figure 4B	021 gypsum	0.428	0.570	−0.142
Figure 4D	n.d. anhydrite	0.248	0.255	−0.007
Figure 4F	200 anhydrite	0.350	0.412	−0.062
Figure 4H	200 anhydrite	0.350	0.378	−0.028
Figure 4H	002 anhydrite	0.312	0.303	+0.009

Not determined, n.d.

^*Reference codes 00-021-0816 and 00-033-0311 for gypsum and Inorganic Crystal Structure Database 016382 for anhydrite.