Formula: ZnZn₂(PO₄)₂ · 4H₂O

Species:

Colour: Yellow, white, colourless, grey or brown; colourless in transmitted light.

Lustre: Vitreous, Pearly

Hardness: 3½

Specific Gravity: 3 – 3.1

Crystal System: Orthorhombic

Member of: Hopeite Group

Name: Named by David Brewster in 1823 in honor of Thomas Charles Hope (1766-1844) Professor of Chemistry, University of Edinburgh. Also a physician. He discovered the element strontium and determined that water’s maximum density occurs at 4°C.

Type Locality: Altenberg Mine, Kelmis, Liège, Wallonia – Belgium

Dimorph of: Parahopeite

Isostructural with: Arsenohopeite