Hopeite Mineral Data

Hopeite Mineral Data +

General Hopeite Information

Chemical Formula:

Zn3(PO4)2·4(H2O)

Composition:

Molecular Weight = 458.17 gm

Zinc 42.82 % Zn 53.29 % ZnO

Phosphorus 13.52 % P 30.98 % P₂O₅

Hydrogen 1.76 % H 15.73 % H₂O

Oxygen 41.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₃(PO₄)₂·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1908

Locality:

Vieille Montagne (Altenberg), Moresnet, Liège Province, Belgium. Link to MinDat.org Location Data.

Name Origin:

Named after the Scottish chemist, Thomas Charles Hope (1766-1844).

Synonym:

ICSD 34869

PDF 37-465

Hopeite Image

Images:

Hopeite

Comments: Brownish pink, transparent crystalline aggregate of hopeite crystals.
Location: Broken Hill mine, Kabwe, Central, Zambia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Hopeite Crystallography

Axial Ratios:

a:b:c =0.5785:1:0.2746

Cell Dimensions:

a = 10.597, b = 18.318, c = 5.031, Z = 4; V = 976.60 Den(Calc)= 3.12

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.855(1), 4.576(0.55), 9.16(0.55),

Forms:

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Forms: [ 0 1 0] [ 1 1 0] [ 1 3 1] [ 0 3 1]

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Crystal Structure:

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Hill R J , Jones J B , American Mineralogist , 61 (1976) p.987-995, The crystal structure of hopeite

Physical Properties of Hopeite

Cleavage:

[100] Perfect, [010] Good, [001] Poor

Color:

Colorless, Gray white, Yellow, White, Light yellow.

Density:

Diaphaniety:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

3 - Calcite

Luminescence:

None.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Hopeite

Gladstone-Dale:

CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.187,KPDmeas= 0.1945,KC= 0.1944

Optical Data:

Biaxial (-), a=1.572-1.574, b=1.582-1.591, g=1.59-1.592, bire=0.0180, 2V(Calc)=26-82, 2V(Meas)=0-36. Dispersion none.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Hopeite

Electron Density:

r_electron=2.93 gm/cc
note: r_Hopeite=3.00 gm/cc.

Fermion Index

Fermion Index = 0.01775
Boson Index = 0.98225

Photoelectric:

PE_Hopeite= 21.64 barns/electron
U=PE_Hopeite x r_electron= 63.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hopeite is Not Radioactive

Hopeite Classification

Dana Class:

40.3.4.1 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.4)Dana Group

40.3.4.1 Hopeite Zn3(PO4)2·4(H2O) P nma 2/m 2/m 2/m

40.3.4.2 Rollandite! Cu3(AsO4)2·4(H2O) P nma 2/m 2/m 2/m

Strunz Class:

VII/C.11-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.11 - Phosphophyllite - Fahleite series

VII/C.11-10 Phosphophyllite Zn2(Fe,Mn)(PO4)2·4(H2O) P 2₁/c 2/m

VII/C.11-20 Hopeite Zn3(PO4)2·4(H2O) P nma 2/m 2/m 2/m

VII/C.11-30 Parahopeite Zn3(PO4)2·4(H2O) P1 1

VII/C.11-40 Radovanite! Cu2Fe(AsO4)[AsO2(OH)2]·H2O P nma 2/m 2/m 2/m

VII/C.11-50 Smolianinovite (Co,Ni,Mg,Ca)3(Fe,Al)2(AsO4)4·11(H2O) Unk Ortho

VII/C.11-60 Fahleite Zn5CaFe2(AsO4)6·14(H2O) Unk Ortho

Other Hopeite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Print or Cut-and-Paste your Hopeite Specimen Label here :

Hopeite

Zn3(PO4)2·4(H2O)
Dana No: 40.3.4.1 Strunz No: VII/C.11-20
Locality:

Notes: