some photos of Apollo samples

impact-melt breccias

Impact-melt breccias are igneous rocks - they solidified from a melt, although they contain clasts of unmelted rocks and minerals. Impact-melt breccias can be crystalline or glassy. All the ones depicted here are crystalline.

 

Two fragments of Apollo 16 sample 60035, a feldspathic impact-melt breccia. Compositionally, it's quite similar to several feldspathic lunar meteorites. Millimeter scale above. Click on image for enlargement.

 

Fragments of Apollo 16 sample 65015, a poikilitic impact-melt breccia of noritic composition. The greenish color is characteristic of these rocks. Millimeter scale above. Click on image for enlargement.

 

Fragments of the poikilitic impact-melt-breccia lithology in Apollo 17 sample 77075. Like 65015, the composition is noritic. Millimeter scale above. Click on image for enlargement.

 

Fragments of Apollo 17 micropoikilitic impact-melt breccia 77115. Click on image for enlargement.

 

Fragments of Apollo 17 sample 77135, a vesicular, poikilitic impact-melt breccia. The vesicles indicate that there were gas bubbles in the melt when it solidified. It is not known what the identity of the gas was. Millimeter scale above. Click on image for enlargement.

 

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