hopeite

Hopeite is a hydrated zinc phosphate with formula: Zn3(PO4)2·4H2O. It is a rare mineral used mainly as a collectors specimen.

Key facts

Mineral.name: Hopeite
Mineral.category: Phosphate minerals
Mineral.image: Hopeite Vieille Montagne.jpg
Mineral.imagesize: 260px
Mineral.caption: Hopeite Belgium – Type locality
Mineral.formula: Zn3(PO4)2·4H2O
Mineral.IMAsymbol: Hop
Mineral.molweight: 458.17 g/mol
Mineral.strunz: 8.CA.30
Mineral.system: Orthorhombic
Mineral.class: Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Mineral.symmetry: Pnma
Mineral.color: Colorless, gray white, yellow, white, light yellow
Mineral.habit: Encrustations – Forms crust-like aggregates on matrix. Prismatic – crystals shaped like slender prisms (e.g. tourmaline). Reniform – kidney-like in shape (e.g. hematite).
Mineral.cleavage: [100] Perfect, [010] good, [001] poor
Mineral.fracture: Uneven – flat surfaces (not cleavage) fractured in an uneven pattern
Mineral.mohs: 3–3.5
Mineral.luster: Vitreous (glassy)

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Wikidata facts

Image: Hopeite Vieille Montagne.jpg

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Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 8.CA.30
Commons category: Hopeite
Nickel-Strunz 9th edition (updated 2009): 8.CA.30
IMA Mineral Symbol: Hop
chemical formula: Zn₃(PO₄)₂·4H₂O
Strunz 8th edition (series ID, updated): VII/C.06

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Hopeite is a hydrated zinc phosphate with formula: Zn3(PO4)2·4H2O. It is a rare mineral used mainly as a collectors specimen.

Hopeite crystallizes in the orthorhombic system with prismatic, vitreous white to yellow crystals. It also forms druzy encrustations and reniform (kidney-shaped) masses. The related mineral parahopeite, which has the same composition but different crystal structure, is triclinic. The minerals are formed through oxidation of sphalerite by the presence of phosphate-rich solutions.