unidentified altered material in black mineral

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Locality: Autoroute 155 roadcut, Mékinac RCM, Mauricie, Québec, Canada

This is a magnification of the brown feldspar piece with black prisms. The field of view here is about 12mm. The olive brown mineral is initmately associated with the black mineral and appears to be altered from it. Note the texture of the mineral.

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Photo added: 11th Dec 2008

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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.
Current server date and time: 15th Feb 2012 21:20:20