15598 (10) Olivine Basalt
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Fact sheet
Description: 

15598 is a fine-grained, olivine-phyric basalt consisting of scattered olivine phenocrysts 0.6 to 1.3mm across, set in an intergranular matrix of plagioclase, pyroxene and opaque minerals. The olivine phenocrysts are subhedral to anhedral in outline, with embayed rims and ragged or fritted grain boundaries (see rotations 1 & 2). The groundmass consists of subhedral plagioclase laths 0.1 to 0.8mm long separated by a fine granular aggregate of pyroxene, ilmenite, and ulvospinel. Cristobalite, fayalite and residual glass are distributed in residual patches, but these are generally small and evenly distributed throughout the sample. The groundmass pyroxene is generally only 0.1mm to 0.4mm in diameter and forms a granular mosaic that fills in between plagioclase laths. Metallic iron often forms small globules within troilite.

The sample weighed 135.7 grams before analysis. It has not been dated.

Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/

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Not known
Ma = Millions of years ago
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igneous
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