15649 (6) Shocked Basalt
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Fact sheet
Description: 

This small basalt sample is brecciated and partially shock-melted and was collected in a large rake sample. It is a member of the olivine-normative clan of Apollo 15 basalts and is paired with 15648. It consists of crushed mineral debris surrounded by dark-brown glassy mesostasis. Remnants of the original microgabbroic texture are present. Although 15649 is not brecciated, it appears to be “shock-fractured”. Plagioclase has not been maskelytenized. Opaque phases include chromite, ulvospinel, ilmenite, metallic iron and troilite. Mg-rich olivine phenocrysts are fractured. Fayalite is present in the groundmass. Rotation 1 shows compositionally zoned pyroxene crystals and rotation 2 shows twinning in another pyroxene crystal.

The sample weighed 6.2 grams before analysis and 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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metamorphic
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