60625 (7) Impact Melt Breccia
 >View Microscope
Fact sheet
Description: 

60625 is a white rock collected as a rake sample from near the Lunar Module. The composition shows it is plagioclase-rich, but it also has high content of rare earth elements (i.e. it is an unusual breccia or impact melt rock). Texturally it contains irregular oikocrysts (pyroxene) up to 1 mm, enclosing euhedral plagioclase chadocrysts. Some plagioclase is shocked. The mineralogy is 65% plagioclase (An95), 17% olivine (Fo77) and 16% pyroxene (Wo7En75Fs18) with minor ilmenite, armalcolite and a K-rich phase. In reflected light, metallic iron can be seen to forms rounded crystals mantled by troilite.

The sample weighed 117 grams before analysis and has not been dated.

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

Our thin section image shows a sequence of numbers (1-3) that have been scribed on the glass behind the three rock fragments. In places the thin section is thick so between crossed polars some plagioclase crystals are yellow instead of shades of grey.

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

Rock forming mineral:

What\
Accessory minerals:

Accessory minerals:

What\