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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Three-dimensional shape distribution of lunar regolith particles collected by the Apollo and Luna programs

Fig. 3

Zingg diagrams showing the average tree-axial ratios of lunar regolith particles. A The average of whole texture types (m-, p-, ag-, ag/m-, and ag/p-types). B The average of only m- and p-types. The ratios of Itokawa regolith particles (Tsuchiyama et al. 2017) (N = 75) and fragments of hypervelocity impact experiments (Michikami et al, 2018) (S2129: Q = 6540 J/kg, N = 117; S2126: Q = 4280 J/kg, N = 287; S2130: Q = 2470 J/kg, N = 334; S2128: Q = 1190 J/kg, N = 201; S2131: Q = 1050 J/kg, N = 295; S2137: Q = 390 J/kg, N = 229; S2570: Q = 270 J/kg, N = 258; S2132: Q = 230 J/kg, N = 266) are also shown. L, I, and S are the longest, intermediate, and shortest lengths of three-axial lengths of a particle, respectively. The square and circle symbols show the samples from lunar maria and highlands, respectively. The dotted lines show the 2D silver ratio

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