|It is requested that a photograph be included in this article to improve its quality.
The Free Image Search Tool may be able to locate suitable images on Flickr and other web sites.
This article looks a lot like copypasta from a copyrighted site. 18.104.22.168 07:20, 23 March 2007 (UTC)
Prior content in this article duplicated one or more previously published sources. The material was copied from: http://www.sciencedirect.com/science/article/pii/S0300944005001608 and several books, including Industrial Minerals & Rocks: Commodities, Markets, and Uses.. Infringing material has been rewritten or removed and must not be restored, unless it is duly released under a compatible license. (For more information, please see "using copyrighted works from others" if you are not the copyright holder of this material, or "donating copyrighted materials" if you are.) For legal reasons, we cannot accept copyrighted text or images borrowed from other web sites or published material; such additions will be deleted. Contributors may use copyrighted publications as a source of information, but not as a source of sentences or phrases. Accordingly, the material may be rewritten, but only if it does not infringe on the copyright of the original or plagiarize from that source. Please see our guideline on non-free text for how to properly implement limited quotations of copyrighted text. popflock.com resource takes copyright violations very seriously, and persistent violators will be blocked from editing. While we appreciate contributions, we must require all contributors to understand and comply with these policies. Thank you. Moonriddengirl (talk) 19:13, 21 April 2012 (UTC)