70147 (4) Ilmenite Basalt
We would like to thank the following for the use of this sample:
70147 is a high-Ti, plagioclase-poikilitic basalt that was collected from a basaltic boulder named the "Geophone Rock". It is a medium grey, sub-angular, mare basalt which contains no cavities. Anhedral and blocky ilmenite forms an intersertal texture with plagioclase and pyroxene. Ilmenite contains chromite and rutile exsolution lamellae. Rare discrete chromite-ulvospinel grains are present, usually included in pyroxene. Armalcolite without ilmenite rims is present as inclusions in pyroxene. Metallic iron, minor silica, and troilite form interstitial phases. Plagioclase exhibits moderate core-to-rim variation (An76-90), with the rims being more sodic. Pyroxene compositions range from pigeonite to titan-augite, with both variants zoning to a common, more Fe-rich composition. A melt inclusion is shown in rotation 2.
The sample weighed 1.35 grams before analysis and has not been dated.
Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/
Ma = Millions of years ago
Rock forming mineral:
- metallic iron,