10031 - High-K ilmenite basalt
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Fact sheet
Description: 

10031 is a high-K ilmenite basalt. The rock cooled quickly (quenched) after eruption and texturally it can be described as a vitrophyre (a glass-rich rock with some larger crystals). The rock was erupted and cooled around 3.6 billion years old ago.

In thin section, it contains phenocrysts of olivine and the rare iron-magnesium titanite, armalcolite. The matrix of this volcanic rock is composed of a fine-grained to glassy groundmass. The armalcolite is mantled by rutile-bearing ilmenite. Platy ilmenite with feathery edges, pyroxene and minute troilite spheres can also be observed in reflected light. You may spot some small black holes in a grid pattern in the glue on this sample - we believe this may have been caused by analysis using an electron microprobe.

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

In Place
In Time
Accuracy:
Location precision: 
Good
Timescale:
Not known
Ma = Millions of years ago
In Focus
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Type:
Type: 
igneous
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