72395 (72) Impact Melt Breccia
Click the microscope button to view a thin section for this sample.
Click the microscope button to view a thin section for this sample.

Fact sheet

72395 (72) Impact Melt Breccia

72395 is an impact melt breccia with about 80% of crystalline matrix (100 microns) and 10% void space. The groundmass of 72395 consists of an interlocking network of small pyroxene oikocrysts that enclose abundant chadocrysts of plagioclase. Randomly dispersed ilmenite grains with sieve-like texture enclose both plagioclase and pyroxene. A wide range of accessory minerals have been found in this sample: armalcolite, ilmenite, baddeleyite, apatite, metallic iron, pink spinel.
    Rotation 1 shows a norite clast and rotation 2 shows a mineral clast-rich region (plagioclase feldspar mainly).

The sample weighed 536.4 grams before analysis and has been dated at 3.893 ± 0.016 billion years (Ar/Ar).

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

About this collection

Sample details

Rock-forming mineral
Accessory minerals
metallic iron
Category guide  
Category Guide
Refers to any word or phrase that appears in the individual rock names. Names are generally descriptive; they allow users to search for broad terms like ‘granite’ as well as more specific names such as ‘breccia’. However, the adjacent descriptions of the specimens captures a wider range of general words and phrases and is a more powerful search tool.
Refers to any word or phrase that appears anywhere in the descriptions of the specimens
Accessory minerals
Minerals that occur in very low abundance in a rock. They are usually not visible with the naked eye and contribute perhapssver, they often dominate the rare elements such as platinum group metals.
Rock-forming minerals
Minerals that make up the bulk of all rock samples and are also the ones used in rock classi?cation.
Selecting one or more period, for example 'Jurassic'.
A term used to group together related samples that are not already gathered into a single Collection. For instance, there is a ‘SW England granites’ theme that includes such rock types as granite, hydrothermal breccia, skarn and vein samples.
A general term used to label a rock sample. It is a useful way of grouping similar samples throughout a collection. Category names are often, but not exclusively, common rock names (e.g. granite, basalt, dolerite, gabbro, greisen, skarn, gneiss, amphibolite, limestone, sandstone).
The owner of the sample that appears in the collection. For example, NASA owns all the samples that appear in the Moon Rocks collection
We would like to thank the following for the use of this sample: