72738 (15) Impact Melt Breccia
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Fact sheet
Description: 

72738 is an impact melt breccia with a microsubophitic matrix (modally 87%) and abundant plagioclase feldspar clasts (see rotation 1). An anorthosite clast of polygonised plagioclase is shown in rotation 2.  72738 has the same chemical composition as other Apollo 17 impact melt breccias. Zircon, metallic iron and troilite are minor constituents of the sample.

The sample weighed 23.8 grams before analysis and has been dated at 3.94±0.04 billion years.

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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metamorphic
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