Robertsite

From Wikipedia, the free encyclopedia

This chemistry related article lacks information on the notability (importance) of the subject matter. Please help improve this article by providing context for a general audience, especially in the lead section. (help, talk)

This article is orphaned as few or no other articles link to it. Please help introduce links in articles on related topics. (November 2006)

Robertsite, Ca₆Mn₉(PO₄)₉O₆(H₂O)₆·3(H₂O) (alternatively formulated Ca₂(Mn₃(PO₄)₃O₂)(H₂O)₃), is a secondary phosphate species named for Willard Lincoln Roberts (1923-1987), mineralogist and professor who taught at South Dakota School of Mines in Rapid City, South Dakota. The type locality for Robertsite is the Tip Top mine, Custer County, South Dakota, USA.
Robertsite occurs at the Tip Top Mine as minute crystal aggregates and crusts found on quartz associated with Triphylite dark reddish brown to black in color.

[edit] External links

• Mindat.org entry

[edit] References

• Frank C. Hawthorne (1998). "Structure and chemistry of phosphate minerals" (abstract page). Mineralogical Magazine 62 (2): 141–164. doi:10.1180/002646198547512. 
• Moore, P.B. (1974). "Isotypy of robertsite, mitridatite and arseniosiderite". Amer. Mineral. B59: 55–59.