Guimaraesite

Formula: Ca2(Zn,Mg,Fe2+)5Be4[(OH)4|(PO4)6] · 6H2O

Origin of name: 

 

Crystal system: Monoclinic

Crystal class: 2/m

Twinning: 

Unit cell: a = 15.98, b = 11.84, c = 6.63, β = 95.15°

 

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Comments:  Member of the roscherite group

 

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