Formula: K3(UO2)4(SO4)2O3(OH) · 3H2O

Colour: Golden yellow, light yellow, orange-yellow

Lustre: Silky, Dull

Hardness: 2

Specific Gravity: 4.88

Crystal System: Monoclinic

Member of: Zippeite Group

Name: Named by William Haidinger in 1845 in honour of František Xaver Maximilian Zippe (1791-1863), mineralogist.

Type Locality: Elias Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region – Czech Republic

Many of the specimens that are labeled “zippeite” are actually natrozippeite (the sodium-dominant member of the group), especially those from sedimentary deposits.

Co-Type Localities: Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA; Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey – USA

Isostructural with: Bromellite