Parahopeite Mineral Data

Parahopeite Mineral Data +

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General Parahopeite 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:

Kabwe (Broken Hill), Central province, Zambia Link to MinDat.org Location Data.

Name Origin:

Named for it's dimorphic relationship to hopeite.

Synonym:

ICSD 16979

PDF 39-1352

Parahopeite Image

Images:

Parahopeite

Comments: Transparent, prismatic parahopeite crystals with keckite.
Location: Hagendorf, Bavaria, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Parahopeite Crystallography

Axial Ratios:

a:b:c =0.7625:1:0.6993

Cell Dimensions:

a = 5.755, b = 7.547, c = 5.278, Z = 1; alpha = 93.35°, beta = 91.18°, gamma = 91.42° V = 228.73 Den(Calc)= 3.33

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 7.56(1), 2.99(0.9), 4.48(0.7),

Forms:

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Forms: [ 1 1 1] [ 0 1 1] [ 0 1 0] [ 3 2 2] [ 1 1 1] [ 1 1 0] [ 0 1 1] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Chao G Y , Zeitschrift fur Kristallographie , 130 (1969) p.261-266, Refinement of the crystal structure of parahopeite

Physical Properties of Parahopeite

Cleavage:

[???] Distinct

Color:

Colorless.

Density:

3.3

Diaphaniety:

Transparent

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Parahopeite

Gladstone-Dale:

CI meas= 0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1878,KPDmeas= 0.1895,KC= 0.1944

Optical Data:

Biaxial (+), a=1.614, b=1.625, g=1.637, bire=0.0230

Calculated Properties of Parahopeite

Electron Density:

r_electron=3.23 gm/cc
note: r_Parahopeite=3.30 gm/cc.

Fermion Index

Fermion Index = 0.01775
Boson Index = 0.98225

Photoelectric:

PE_Parahopeite= 21.64 barns/electron
U=PE_Parahopeite x r_electron= 69.82 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Parahopeite is Not Radioactive

Parahopeite Classification

Dana Class:

40.3.3.1 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.3)Dana Group

40.3.3.1 Parahopeite Zn3(PO4)2·4(H2O) P1 1

Strunz Class:

VII/C.11-30 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 Parahopeite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Parahopeite

Zn3(PO4)2·4(H2O)
Dana No: 40.3.3.1 Strunz No: VII/C.11-30
Locality:

Notes: