10046 (53) - Basaltic regolith breccia
We would like to thank the following for the use of this sample:
Sample 10046 is a multi-clast breccia held together by a matrix of glass formed during a large meteorite impact. Small zap pits on the surface of the hand specimen mark the position of micrometeorite impacts. This specimen was collected by Neil Armstrong on 20 July 1969 during Apollo 11 – the first manned mission to the Moon.
In thin section the fine-grained matrix glass appears black both in plane polarised light and between crossed polars. The breccia contains mineral fragments ranging from a few microns across up to over 100 microns across, and rare brown volcanic glass spherules. The sample also contains larger fragments of glass and rock with a range of textures and grain sizes, and also several reworked fragments of earlier breccias.
Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/
Ma = Millions of years ago
Rock forming mineral: