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Mineralpedia Details for Keckite

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Keckite

Keckite

Erich Keck, a German collector of Hagendorf minerals, is the namesake for Keckite. Keckite is a rare weathering product of phosphates in granite pegmatites. It can be found in Germany, Portugal, and newer localities in the United States, Australia, and the Democratic Republic of the Congo.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/keckite.pdf

Formula
CaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3ยท7H2
Crystal System
Monoclinic 
Crystal Habit
Fan Shaped 
Cleavage
Poor, Indistinct, None 
Luster
Earthy (Dull) 
Color
brown, gray brown, yellow brown 
Streak
yellow white 
Class
Monoclinic - Prismatic 
Fracture
Flexible 
Hardness
4.5 
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Keckite from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Keckite
            from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Keckite is isostructural with Jahnsite and found chielfy in phosphate pegmatites and is named in honor of Erich Keck. Erich is a long time expert on phosphate mineraolgy especially Hagendorf. The crystals here are small amber colored rosettes or clusters to about 0.75mm on Mitridatite.

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