15016 (146) Vesicular Olivine Basalt
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Fact sheet
Description: 

15016 is a medium-grained basalt with subhedral phenocrysts of zoned pyroxene (1-2 mm) and olivine (~1 mm) set in a matrix of sub-ophitic intergrowths of pyroxene and plagioclase. Vesicles (1 to 5 mm) make up about 50 % of the volume. Opaque minerals (ilmenite and ulvöspinel) frequently border the vesicles. Plagioclase platelets are sometimes hollow, with pyroxene cores. Subrounded grains of Cr-spinel are found in the pyroxene and olivine phenocrysts. Troilite and metallic iron are found in the groundmass. Rotation 1 shows a small cristobalite crystal (centre).

The sample weighed 923.7 grams before analysis and has been dated at 3.38±0.08 billion years (Ar/Ar).

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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