71557 (6) Ilmenite Basalt
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Fact sheet
Description: 

71557 is a plagioclase-poikilitic ilmenite basalt that was collected as part of a rake sample. It is a coarse-grained basalt with large plates of plagioclase poikilitically enclose crystals of pyroxene, olivine and ilmenite. Some areas have a sub-ophitic texture with intergrown plagioclase and pyroxene (rotation 2). Olivine grains are found in groups. Tranquillityite, armalcolite, Cr-spinel, rutile, zirconolite, baddeleyite, titanite, troilite, metallic iron and silica are present in minor amounts.

The sample weighed 40.35 grams before analysis and has not been dated.

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

The dark patches are areas where the rock slice has lifted from the surface of the glass slide.

In Place
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Timescale:
Not known
Ma = Millions of years ago
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Type: 
igneous
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