Armalcolite

From Wikipedia, the free encyclopedia

Armalcolite is a mineral that was discovered at Tranquility Base on the Moon by the Apollo 11 crew in 1969. It was named for Armstrong, Aldrin and Collins, the three Apollo 11 astronauts. Examples of this mineral were later discovered in various locations on Earth as well, such as Smoky Butte, Garfield County, Montana, USA in lamproite dikes and plugs; Disko Island, (Greenland) in native iron; Pripyat Swell (around the Pripyat River, Ukraine) in trachybasalt and in South African kimberlites.

Armalcolite has a chemical formula of (Mg,Fe++)Ti2O5. It has a Mohs hardness of 6 and a specific gravity of 4. It forms grey sub to anhedral masses with a crystal structure that is orthorhombic prismatic. Armalcolite is a part of the pseudobrookite group which consists of minerals of the general formula X2YO5. X and Y are usually Fe (2+ and 3+), Mg, Al, and Ti. End members are armalcolite (MgFeTi2O5), pseudobrookite (Fe2TiO5), and ferropseudobrookite (FeTi2O5).

 This article about a specific mineral, mineraloid, or rock type is a stub. You can help Wikipedia by expanding it.
Retrieved from "http://en.wikipedia.org../../../a/r/m/Armalcolite.html"
Advanced Search
Included Web Search Engines


Safe Search

close

Top Matching Results

Occasionally Search.com will highlight specialized results that are based on the context of your query. Examples of specialized results include specific links to news, images, or video.

Top Matching Results may highlight information from other Search.com pages, content from the CNET Network of sites, or third party content. The listings are based purely on relevance. Search.com does not receive payment for listings in this section but our partners that provide this data may get paid for listing these products.

Sponsored Links

This section contains paid listings which have been purchased by companies that want to have their sites appear for specific search terms and related content. These listings are administered, sorted and maintained by a third party and are not endorsed by Search.com.

Search Results

Search.com sends your search query to several search engines at one time and integrates the results into one list which has been sorted by relevance using Search.com's proprietary algorithm. You can customize the list of search engines included in your metasearch from the preferences.

The search engines that are used in your metasearch may allow companies to pay to have their Web sites included within the results. To view the Paid Inclusion policy for a specific search engine, please visit their Web site. Search.com does not accept payment or share revenue with any search engine partner for listings in this section.