15058 (130) Pigeonite Basalt
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Fact sheet
Description: 

15058 is one of the largest basalt samples returned from the Moon. Large phenocrysts of pigeonite dominate the texture. The crystals are long (up to 2 cm in length) and highly zoned (rotation 2). Olivine is rare and restricted to the cores of large pigeonite crystals. Clusters of radiating plagioclase crystals are common. Vugs contain pyroxene and plagioclase. The accessory mineral assemblage includes ilmenite, spinel, fluorapatite, chlorapatite and cristobalite (rotation 2).

The sample weighed 2672 grams before analysis and has been dated at 3.358±0.2 billion years (Ar/Ar).

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

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Ma = Millions of years ago
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igneous
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