10020 - Ilmenite basalt
 >View Microscope
Fact sheet
Description: 

10020 is a variety of fine-grained ilmenite rich basalt with low potassium concentrations like many of the lunar Mare basalts. The sample is rounded and covered with micrometeorite craters. It has been formed from a high Ti-, Fe-rich volcanic liquid that cooled rapidly and contains both Mg-rich olivine (as phenocrysts) and cristobalite (in the fine-grained groundmass). It crystallised 3.77 billion years ago and has been exposed at the surface for around 130 million years.

The overall texture in thin section is characterised by an open network of randomly-oriented plagioclase laths and ilmenite platelets. Olivine phenocrysts are up to three times as large as the other major minerals and are commonly clumped together in groups, suggesting that olivine may have formed before the magma was extruded.

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
Collection:
What\
Type:
Type: 
igneous
What\
Rock-forming minerals:

Rock forming mineral:

What\
Accessory minerals:

Accessory minerals:

What\