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Compressibilities of Lunar Crystalline Rock, Microbreccia, and Fines to 40 Kilobars

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Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 731-732
DOI: 10.1126/science.167.3918.731


The compressibilities of three lunar samples were studied at room temperature from 0 to 40 kilobars. The samples were a fine-grained vesicular crystalline rock (type A), a microbreccia (type C), and fines (type D). All samples were porous. The microbreccia and fines were quite compressible at all pressures; the compressibility of the crystalline rock was somewhat less, being 8.4 megabar-1 at 1 atmosphere and 1.5 megabar-1 at 35 kilobars. Some porosity appeared to remain in the samples at all pressures. Thus the pressure-volume data derived from these samples may be representative of porous surface and near-surface material in the vicinity of the Apollo 11 landing site but may not be representative of lunar material at depth.

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