71055 (68) Vesicular Ilmenite Basalt
 >View Microscope
Fact sheet
Description: 

Lunar basalts 71035, 71036, 71037 and 71055 were all chipped from the top of a 0.5 m tall boulder. All samples are the same kind of high-Ti basalt with low olivine and silica contents. These samples are all very vesicular - up to 30%. Vugs extend up to 12 mm. The texture has been described as plagioclase-poikilitic. Average grain size is 1–2 mm with seriate grain size distribution. The largest pyroxene grains (up to 2 mm) are typically composite and composed of pale-pink (Al- and Ti-poor) to dark-pink (Al- and Ti-rich) arranged in parallel bands, in a radiating spherulitic pattern, or forming an hour-glass structure. Rotation 2 shows a pyroxene inclusion in plagioclase feldspar.

The sample weighed 669.6 grams before analysis and has been dated at 3.64±0.09 billion years (Rb-Sr).

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

In Place
In Time
Accuracy:
Timescale:
Not known
Ma = Millions of years ago
In Focus
Collection:
What\
Type:
Type: 
igneous
What\
Rock-forming minerals:

Rock forming mineral:

What\