Results 181 to 190 of about 15,850 (231)

The lunar regolith: Chemistry, mineralogy, and petrology

Reviews of Geophysics, 1982
The lunar regolith, a several meter thick layer of unconsolidated debris, forms the interface between the moon and its space environment. The regolith forms from lithic sources by the destructional processes of comminution and the constructional processes of agglutinate formation. In this manner a steady state soil can develop and will remain in a type
J. J. Papike, S. B. Simon, J. C. Laul
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Lunar Anorthosite 15415: Texture, Mineralogy, and Metamorphic History

Science, 1972
Lunar anorthosite 15415 consists almost entirely of anorthite (homogeneous anorthite 96.6 molecule percent), with accessory diopsidic augite and traces of hypersthene, ilmenite, and a silica mineral. The rock has had a complex metamorphic history. The texture reflects at least two episodes of shearing (followed by intense and partial recrystallization,
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Mineralogy, petrology, and geochemistry of the lunar samples

Reviews of Geophysics, 1975
The years 1971–1974 mark the maturing of lunar mineralogy, petrology, and geochemistry into a full‐fledged science. During these years the prime objective of lunar sample investigation teams changed from general surveys of the nature of returned lunar material into problem‐oriented studies. Four general areas of interest that evolved during these years
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Lunar cryptomaria: Mineralogy and composition of ancient volcanic deposits

Planetary and Space Science, 2015
Abstract Ancient lunar volcanic deposits, known as cryptomaria, have been detected by remote telescopic and orbital measurements since the 1970s. Cryptomaria are most easily identified by the presence of dark-halo impact craters and are associated with a mare basalt mineralogy, which is indicated by two pyroxene spectral absorption features near 1 μm
Whitten, Jennifer, Head, James W.
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Mineralogy and Petrography of Lunar Samples

Science, 1970
The lunar samples consist largely of augite, calcic plagioclase, and ilmenite. Olivine is a minor constituent of some rocks, as is cristobalite. Other minerals present in small amounts include tridymite, chromite, kamacite, taenite, and troilite. The principal rock types can be broadly grouped into ilmenite basalts and breccias.
B, Mason, K, Fredriksson, E P, Henderson, E, Jarosewich, W G, Melson, K M, Towe, J S, White   +6 more
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Mineralogy and Petrology of Some Lunar Samples

Science, 1970
Chemical analyses and norms of four samples are presented which confirm original estimates of low silica, unusual abundance of titania, and low oxidation state of the rocks. Accounts are given of mineralogy and petrology of fine- and coarse-grained igneous rocks and microbreccias with emphasis on chemical composition of individual minerals and glasses.
S O, Agrell, J H, Scoon, I D, Muir, J V, Long, J D, McConnell, A, Peckett   +5 more
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Mineralogical and Petrological Investigations of Lunar Samples

Science, 1970
Fragments of igneous rocks and breccias, and one coarse-grained rock with thin sections, have been studied. Minerals found include pyroxene, plagioclase, olivine, ilmenite, troilite, ulvöspinel, native iron, cristobalite, tridymite, alkali feldspar, apatite, and quartz. Textures are described and interpreted.
J C, Bailey, P E, Champness, A C, Dunham, J, Esson, W S, Fyfe, W S, Mackenzie, E F, Stumpfl, J, Zussman   +7 more
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Mineralogy and Deformation in Some Lunar Samples

Science, 1970
Observations on the mineralogy and deformation in samples of crystalline rocks, breccias, and fines from Tranquillity Base provide evidence for magmatic and impact processes. Overall homogeneity, igneous textures, and absence of xenoliths in the crystalline rocks indicate derivation from a common titanium-rich magma by internal, anorogenic volcanism ...
J A, Douglas, M R, Dence, A G, Plant, R J, Traill   +3 more
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Lunar Soil: Size Distribution and Mineralogical Constituents

Science, 1970
The lunar soil collected by Apollo 11 consists primarily of submillimeter material and is finer in grain size than soil previously recorded photographically by Surveyor experiments. The main constituents are fine-grained to glassy rocks of basaltic affinity and coherent breccia of undetermined origin. Dark glass, containing abundant nickel-iron spheres,
M B, Duke, C C, Woo, M L, Bird, G A, Sellers, R B, Finkelman   +4 more
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Mineralogical studies of lunar rock 12013, 10

Earth and Planetary Science Letters, 1970
Abstract A preliminary report is given on the mineralogy of three fragments of lunar rock 12013, 10. In both light and dark areas crystals of plagioclase, alkali feldspar, ilmenite, quartz and other minerals are encrusted with a sugary coating of quartz. This coating also contains dispersed opaque fine particles and small crystallites of SiC, brasses
P. Gay, M.G. Bown, K.O. Rickson
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