Anorthite (Var: Bytownite)

Photo Copyright © 2007 by Collectors Edge. All Rights Reserved.
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Locality: Dorado Mine, Casas Grandes, Chihuahua, Mexico

Note: The mineral species Bytownite is not listed in our database for this locality. This specimen may be misidentified or the mindat list of minerals at this locality may be incomplete.

Bytownite is a calcium rich member of the plagioclase solid solution series of feldspar minerals. It is usually defined as having "%An" between 70 and 90. Like others of the series, bytownite forms grey to white triclinic crystals commonly exhibiting the typical plagioclase twinning and associated fine striations. Bytownite occurs in gabbro intrusions and in metamorphic complexes. The mineral was first described in 1835 and named for an occurrence at Bytown (now Ottawa), Canada. This is a fine example of the species.

Size: 42mm x 20mm x 27mm

Collection: Ex- Martin Zinn Collection

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Photo added: 5th Dec 2007

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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