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

Earth, Planets and Space

Table 1 Lunar regolith samples imaged by microtomography in the present study

Sample	Mission	Sampling site	Grain size (µm)	Maturity	Energy (kev)	Voxel size (µm)	N
10084	Apollo 11	Mare Tranquillitatis	75-105	Mature²	20. 24.9	1.73, 1.74	199
L1613-1	Luna 16	Mare Fecunditatis	<83	Mature or submature	25	1.3	107
L1613-3	Luna 16	Mare Fecunditatis	127-200	Mature or submature	20, 24.9	1.73, 1.74	389
L24130.3-1	Luna 24	Mare Crisium	<74	Immature	25	1.3	65
L24130.3-2			74-95		20, 24.9	1.73, 1.74	1108
L24130.3-3			95-200		20, 24.9	1.73, 1.74	318
L24130.3-4			200-370		20	1.73	70 (102)⁴
60501¹	Apollo 16	Descartes highlands	75-105	Mature³	20	1.73	104
L2001-1	Luna 20	Apollonius highlands	<83	Mature or submature	25	1.3	143
L2001-4	Luna 20	Apollonius highlands	200-450	Mature or submature	17.9, 18.1, 24	1.73, 1.74	77 (103)⁴

¹Particles of 105–250 μm in size also examined with microtomography by Katagiri et al. (2014)
²Is/FeO = 78 (Morris et al. 1978)
³Is/FeO = 80 (Morris et al. 1978)
⁴Small particles that might be formed by fragmentation after sieving were omitted in the analysis (the total number of the particles measured are shown in the parenthesis)