hopeite
Sign in to saveHopeite 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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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.