10058 - Coarse grained ilmenite basalt
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

10058 - Coarse grained ilmenite basalt

10058 is a coarse-grained ilmenite basalt (weight 282 grams) that is 3.7 billion years old. It has also been described as a medium-grained, vuggy, ophitic, cristobalite basalt. The cristobalite is relatively abundant (modally 5%) and has a distinctive cracking pattern due to inversion of high to low cristobalite structure. Rotation 1 shows an example of cristobalite wrapping around ilmenite. Other crystals have lath-like form or appear interstitially. Cristobalite has the same birefringence as plagioclase feldspar so is not at first easy to see. Major constituents in the rock are pyroxene, plagioclase feldspar and ilmenite (modally around 94% in total). Accessory amounts of apatite, troilite, and a Y-Zr mineral (probably tranquillityite) plus a trace of glass are also reported. Pyroxene compositions vary with increasing iron content from augite towards the rare lunar species pyroxferroite. This is one of the rocks in which amphibole has been reported but we don't think it is present in our thin section. Please let us know if you spot it !

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

About this collection

The Apollo 11 samples create an iconic collection since they were the first rocks collected by humankind that were returned to Earth from another solar system body. The Apollo 11 team collected and returned 22 kg of rock and soil samples.

Apollo 11 launched from Cape Kennedy on 16 July 1969. An estimated 530 million people watched Armstrong's televised image and heard his voice describe the event as he took "...one small step for a man, one giant leap for mankind" on 20 July 1969.

Sample details

Collection: Apollo 11
Rock-forming mineral
Accessory minerals
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: