Staurolite (nonfiction)

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Staurolite is a red brown to black, mostly opaque, nesosilicate mineral with a white streak. It crystallizes in the monoclinic crystal system, has a Mohs hardness of 7 to 7.5 and the chemical formula: Fe2+2Al9O6(SiO4)4(O,OH)2. Magnesium, zinc and manganese substitute in the iron site and trivalent iron can substitute for aluminum.

https://en.wikipedia.org/wiki/Staurolite

https://www.royaltonmn.com/vertical/sites/%7BF29AE369-80CF-4CFB-BE87-851B6F04B18E%7D/uploads/Cross_Rock_Directions.pdf

https://www.royaltonmn.com/vertical/sites/%7BF29AE369-80CF-4CFB-BE87-851B6F04B18E%7D/uploads/Area_Map_with_cross_rock_location(1).pdf

http://www.findingrocks.com/cgi-bin/viewlocation.cgi?location_id=185

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