12018 (10) - Olivine basalt
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Fact sheet
Description: 

12018 is an olivine basalt with an apparent accumulation of mafic minerals. It is medium-grained with an average grain size of about 0.4 to 1.0 mm and  consists of 70-80% larger olivine and pyroxene crystals set in 20% variolitic matrix. Pyroxene crystals are elongate and compositionally zoned. 12018 also contains an association of fayalite-K-rich glass-phosphate that is interpreted as residual melt. 

The sample weighed 787 grams before analysis. It has not been dated. 

Over the years the resin holding the rock slice to the glass slide has deteriorated and in places appears as brown patches. 

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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